"Amazing media machine"5.0 starson by J. Blow
Pros: Most important - TOTALLY QUIET! Unlike all other PC's (<$4K) the Mac makes no noise. Secondly - reliable. I run 2 of these bootcamped/XP and they are stone reliable. I have only had one of the machines crash once in 2 years. Third - Small - tiny.
Cons: Nothing major. I did have a drive fail and I replaced it myself. It is a little unusual but you open the case with a butter or putty knife.
Summary: I hear the complaints about drive size and processor/RAM. I run two of these and store all of the data on a NAS. As a result I ordered the smallest harddrives available. I can play back VOB files and Windows Media HD without any issues so for what I'm using them for they have enough power.
Note that I am not running Vista but am planning to convert at least one of the machines to 7 when it ships.
The quality of the hardware is phenominal and saving $100 but getting a noisy fan and cheap case wouldn't be worth it.