The original iPhone may be better looking than the 3G to some, but it doesn't really matter, because if you have either phone and you are smart, you'll get a case for it. A case may detract from the aesthetic of the phone, but the protection a case provides from dropping the phone is worth any drawback.
Almost everyone drops their phone at some point, and if you drop the iPhone without a case, you are much more likely to get a cracked screen.
And of course, with a case, the 2G and 3G look pretty much the same.