I tried an iPhone 4...the proximity sensor issues and other random issues I had with the phone forced me to sell it. I'm a BlackBerry guy, but even then sometimes I wish I had an iPhone lying around for random use, games, and that way I have an all in one iPod/Phone device for my car. I've been looking at 3Gs's on eBay. To me, this is the best iPhone yet. Like the design much better. Trusty and reliable. Would you pay around 280-350 for a mint condition 3Gs on eBay even with the 4 out?