Gizmodo has put together a great comparison on the cost of the iPhone vs. other mobile devices. It makes it clear that your cheapest option is the original iPhone. Users who are thinking of upgrading will have to decide if 3G is worth the extra $160 over two years that it will cost to upgrade.
It also shows how much cheaper the iPhone is overall than competitors like the HTC Tilt, and HTC Mogul, and the Verizon XV6800. While none of them are THAT much more expensive than the iPhone, its really nice to see an Apple product coming in significantly cheaper than the competition.
Click Here to take a look.