maybe a r32, r33 sedan, if you wouldn't want to spend to much on an r34 sedan, or even a JZX90/JZX100 chaser/mk II sedan.
stagea is another good one but the RB25DET in it will have to pull more weight as compared to the weight in the r33 coupe. i have also read that almost all of the stageas are auto's (so u won't have the full potential or the RB25) also the auto trans is a bit laggy.