General TLD question

So I've got a couple of apps I'm going to be releasing soon.  They're intended to be mobile-only - although I do see a possible need to develop a generic website to host some basic info on (and also to serve as the database domain for the apps/etc).

Emotionally - I kinda want a dot.com domain - but the pickin's are slim and I'd have to ruin the name to a degree that it would be unrecognizable as being tied to the app name(s) I've chosen.  I can, however, go the not.com route - and pick something like a .us or .mobi or any of the other variants out there.

Technically - there's no reason for me to stick with a dot.com.  But - since I *am* going to develop a landing page/privacy policy page/etc...is there any reason you can think of where I might want to stay away from the not.com bunch?  Are there any possible SEO ramifications that you're aware of/etc?

Thanks in advance!  Just throwin' it out there!