That's an interesting pick, I myself also own a 4-door R34 😃
(HR34 though instead of ER34, so it has RB20 instead of RB25)
GT-Rs are ultra-expensive indeed, so starting with a 4-door is a wise move
Also, I'd say you can get S13 or S14 as quick as.....now, since some of them are cheap, whether if it's an ex-drifter or not 😉