He should definitely be using the Plasma, as I seem to recall the Plasma's are near CRT in refresh rates. Other wise he should be looking at the 22-24" LCD's as the refresh rates on them are getting down into the 4-5ms range and neglible for gaming purposes. Something like this

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70