I bought the iMac 20" in August 2007. It is by far my best home computer ever, partly because it is my first mac. The glossy screen is gorgeous, unless there is a window behind your chair. The colors are vibrant, the blacks are very black. It is also a very silent machine, even when using it for heavy tasks. And it looks good on my desk.
I liked it so much, that I threw away my old dell laptop and just bought a macbook so my home is all mac.
Just wait a few weeks to buy it, it is due for an upgrade.