The problem with the iPhone 4 is not the death grip, because its such an akward grip anyways and a speck case will fix the issue (you should have a gel case on your phone if you're smart, its $650-$750 to replace!). The problem is the amount of dropped calls that iPhones are notorious for. Its not just an AT&T issue, although it doesn't help considering there are more dropped calls on X phone on AT&T than X phone on, say, Verizon. Verizon is reporting a higher-than-average amount of dropped calls on their iPhones as well. If you want to make calls, then don't get an iPhone. For that reason, I would probably do fine with an iphone 4.
However, the iPhone 4 doesn't have 2ghz of processing power, Swype, a biometric fingerprint sensor, or Webdock accessories. For that reason, I'll stick with the Atrix //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif