My conditions for getting a PS3 have always been:
$400 if I have an HDTV, have time to play more games, and it has several must-own games I want (probably FF13 and a couple others)
$300 for 2/3 of those factors
$200 for 1/3 of those factors
I was disappointed when they got rid of the 20GB model 'cause I would've definitely gotten that one over the 60GB one and it would probably be dropping to $400 next week if it still existed.