I was set on Nokia n900, but preorder for n900 didnt go thru.(due to sell out etc etc and got tired of waiting for one) It gave me time to search for another phone and came upon this Nexus one. The only thing i dont like about nexus one, is exterior look. I dont like that gray frame around the screen. Have anyone take any phone apart and dye it, paint it, leather it, etc etc? My carrier is thru tmobile.
Don't forget one of those coffee can exhaust pipes for the speaker. When it rings you can hear that God awful noise those things make.
And, of course, flames. They will make your phone faster. Joke aside, I don't see why you shouldn't be able to modify your phone. Just be aware of the risks of cracks and stuff when taking it apart.. it's a one way road.