nasa driver with swap questions

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i drive in nasa in so. cal, currently in hpde in my crossfire. my lease is up soon and i was going to get an evo and track in that as well as daily drive, but decided to get a nice comfortable daily driver (2005 dodge magnum hemi) and a dedicated track car. Its basically down to the 240sx and a miata, but im 6'1 and my knees clang against all kinds of stuff in the miata so its about 80% in favor of the 240 right now. i have always dreamed of a swapped 240 and think they look amazing with the silvia front end. and considering i could either get a 150 + mile miata and then have to spend another 3800 on the vodoo turbo kit and hope the motor doesn't go to the crapper, or just purchase a jdm motor with alot less miles and already turbo'd for the 240, the advantage sways in favor of the 240.

so with the background info and intro behind me, i want to get some advice about what motor i should swap into the 240 if i want to run in nasa events. like i said i am currently in hpde but i am working towards getting my racing license and moving up in class in the next 1-2 years.

so what engine is better suited for nasa road racing events in your guys opinion? the blacktop sr20det or the rb25det? i have heard you can make 300whp on a sr20det pretty safely on stock internals, but the rb can go up to 400+ on stock internals, but that is sort of aside from the point. which engine works best as a well balanced track engine? that the main question. thanks in advance. also, what kind of power can the rb20det handle? i have heard 350 or so also, and if that is the case, whats the advantage of that motor, or disadvantage? its much cheaper than the others, any reason for that? is it just because its older?



p.s., before i get flamed i have been reading these forums religously for five days but haven't really found an answer to this question. if you don't want to help out its cool, but if someone does, thanks mucho.

preparing to get , but hope i can get some love.