some of the cons i've found over the years (i think these may have already been brought up)
R33 Gts-T = Ceramic wheel becomes frail when the motor's been deprived of oil or constantly not given time for warm up and cool down i.e not taken care of
S13/4 = hard to come by in good condition nowadays...although it doesn't cost much to acquire one and do an engine rebuild (easily within ur budget)
WRX = MY99's are known to have a very weak gearbox for the power its delivering...im sure there are mods to strengthen the tranny but im not sure how it would fit with the budget...
the MY99's are also the last rexies that came out before the subies became berzerk on car security...i.e. and is a target for many car thieves...

my suggestion...
an old school jdm MZ21 soarer...7mgte's are relatively cheap nowadays...they just have a tendency to have a sh!thouse head gasket that can be easily replaced by an aftermarket item...