Hey, I really like Mike's suggestions for higher givers.
The most important thing for your situation isn't to raise a ton of money, really. It's to use the marketing leverage that you get from having a Kickstarter project to help generate a user base.
Maybe you can have access to the beta group, or call it the alpha tester group? as part of the rewards at a very low level.
Also, you might like this spreadsheet I just posted that helps manage a Kickstarter budget. I built it mostly for arts projects - films, records, etc. - so my advice about what to do with the $25 reward probably doesn't apply. It should be pretty useful for doing the math though, cause the formulas are all baked in for per unit costs, etc. - the really fun part is where you list your probable backers by name, because you're just starting out.
http://kevinclarkcomposer.com/2012/06/how-to-plan-your-kickstarter-part-1/
If you find it useful, let me know! If it's crap... let me know that, too. I want to make it better.