I'll update this if I've got anything more:
$5-fine
$20-fine
$30-fine
$50-add video dev diaries, (maybe also short novella, extra key for a friend if funds exceed goal)
$75-as above and add special portrait set and special vehicle customization options (cosmetic only), (maybe T-shirt, maybe hardcover book (no poster) here if funds exceed goal)
*If possible* give the special portrait options and vehicle customization options to those who've already backed the project through your site or Desura.
*Note* Projects of this scope and with similar reward tiers make the plurality of their money here (at $50 and $75).
$100- too easy to change names, as above and add T-shirt and/or hardcover book here (if not at $75 set)
*New*$150 tier-hardcover art book and T-shirt and laminated postcards (semi-humorous ie scene of burning town asking you to visit) and/or laminated data logs/safety signs/letters from the front (dead serious) plus above
$250-definitely need hardcover book here, maybe a small medallion plus above
$500:
same as above and help design an in-game building and/or item and/or researcher or engineer portrait while adding small personal touch (like graffiti in Town tilesets, custom crop-circle in Farm tilesets, small office posters in Industrial or Base tilesets etc.) plus above
$1000:
same as above plus invite to launch party and portrait as starting soldier and help design a unique terror mission, base defense, UFO recovery, base assault etc. (must be able to travel to London)
$5000:
same as above but team flies you out to launch party plus a day of touring London and offices at teams's expense (subject to restrictions; contact team for more info)
I know I'm being quite presumptuous with my theoretical reward tiers but I think this strikes a good balance between cost and reward. I also know you guys are a new and small studio and you don't want to overreach, so obviously feel free to reject my proposals and dismiss these if you know you can't do it. That being said, I think the ones you have there are a bit underwhelming.
I think studying successful projects like DF Adventure, WL2, Banner Saga, Shadowrun Returns, The Dead Linger, Leisure Suit, Jane Jensen along with non-VG ones like OGRE, Pebble, and others will be worthwhile. Observe what they do right and contact them for tips.
People may be a bit fatigued, if I can use that word, after all these revivalist Kickstarters but as long as you stand out and are transparent, I think you'll succeed.
Some may also want to mix and match different reward tiers, so you may want to take that into consideration (ie Shirt but no book, Book but no Shirt, Poster but no Hardcover book etc.)
I also have some recommendations for the page and the handling of the project itself:
Communicate with fans through Twitter, Facebook, Mailing list
Possible AmA on Reddit
Regular updates on KS page along with (if possible) small clarifications and participation in the "Comments section"
Samplings of art and/or music and links to videos of preview builds in Updates section
Be very clear on shipping costs for International backers (is it based on cost of items shipped or the amount pledged, see here: http://www.kickstarter.com/projects/1613260297/shadowrun-returns, last FAQ question
See if you can update the reward tiers themselves instead of clarifying in the text (Wasteland did it, but Banner Saga said they couldn't)
Video pitch is huge because of first impressions
If you're going to accept PayPal and/or do Kicking it Forward, put that near the top of the page (only accept PayPal if the project is successfully funded; KS deserve their fair share)
Information regarding new updates and reward tiers should also be at the top
Keep in mind reasonable stretch goals and think of promotions like adding $9 between such and such time gives you such and such new addition. (a better example)
Resources to help you
Successful Kickstarter Campaigns:
Wasteland 2
DF Adventure
The Banner Saga
Shadowrun Returns
Grim Dawn (most likely will succeed and credits those who have already pre-ordered; you told me in another thread that might not be possible, so no worries)
Jane Jensen
Leisure Suit Larry
The Dead Linger
Non-Videogame
Ogre Designer's Edition
Pebble: E-Paper Watch
Gunship: First Strike *I don't think you'll need 44 updates, though*
Trends in Graph form
PC Gamer on Double Fine
Kickstarter: Trends in Pricing and Duration
To better communciate what I mean by posters, postcards and more
Rick, a big fan of Wasteland, did an exceptional series of fanart promotional pics here (Page in Russian)
These are either of a humorous, but dark nature or serious
Fallout Posters 1
Fallout Posters 2
Transmissions and Letter Suggestions
I really like how Halo handled it, with ARGs and promotional materials
Cortana's Letters
Transmissions
I Love Bees
Forerunner E-mail
BTW, how much are you guys aiming for?
All the best and good luck