hey mate
have owned 2 r32s both drift cars... started with a stock 20 like your just with a nisstune ecu, fuel pump and suspension work..
car was great to learn in and couldnt have asked for anything better. great platform to begin with.
I honestly have no idea of your driving experience but as far as learning to skid i would honestly say you are far from needing 250-300kw.
learn on the 20, thrash the guts outta it until it blows then drop in a 25
my second 32 which i still have came with the 20 in it again but with HKS turbo etc and around 220kw... short story was the head warped...
went down the same road of questioning as you and am currently building the 25 which i dropped in. Have had it tuned and stock with a fuel pump is running around the 200kw mark which is great. good responsive motor and plenty of torque. spent way too much on suspension but best money i have ever spent oh and running an exedy clutch.. unsure of part number though, Saber front mount and 52mm radiator with thermo fan replacing A/C fan and stock clutch fan for safety as long as a 25? row oil cooler (overkill but necessary)
I have decided to go with either the HKS2835 or GT-RS (or garrett equivelant), 256 cams,splitfire coilpacks, S15 injectors, bosch fuel pumps and surge tank, stock manifold, contemplating a plazmaman intake manifold (forward facing), power FC, nismo fuel reg and am running the stock airbox coz i dont want to be defected .... my power goal is around the 250kw mark, would be unhappy with a lil more but really not needed.
hope what i have offered gives you some insight or help.... feel free to shoot me a pm and i can let you know how i am going with stuff as i go. have almost got all my goodies so should be putting it all together shortly once i get hold of a turbo.... and fix the damage the old man caused by backing the trailer into my car