Any1 Know About Swaps For Ae86 Sr5?

[driver]

i juss sold my winter car and i want to buy a 86 corolla sr5, i saw 3 good condition, reasonably priced ones on the internet. people selling the gts's usually want rediculous amounts of money for them. i was wondering if any1 can tell me possible swaps for this car. is the 20 valve motor the best swap? i want to get atleast 160 to 170 wheel HP with no forced induction. is the 20 valve capable of that? and is that number unreasonable for a budget of about 5 or 6 thousand dollars? and if any1 knows of a reputable place that specializes in building these motors i would appreciate a refference. i was gonna have a local shop here in Minnesota do the swap and internal engine work, but i doubt they've worked with this motor before.

i would also like any info on places that just import the stock motors if any1 knows anything. and why is the gts so much more popular than the sr5? and why do people want so much money for them? is the gts that much of a better drift car than the sr5? im trying to build a drifter since i keep beating the hell outa my FD drifting and i cant help myself. if im making a mistake buy buying a sr5 rather than a gts for some reason please fill me in.