A few things

[Living4surf]

You can get a rb25 for about the same price as jdm of Miami charges for a sr. And the eBay mounts for the rb are pretty cheap and them you just need a drive shaft Which isn't bad plus you can keep the stock radiator

 

[Spirit]

Which RB?

 

[Living4surf]

Series 1 rb25 and for a little more series 2

 

[RADIR]

if you not sure what you want i find this write up ,it might help you ,http://www.nissanclub.com/forums/sr20det-engine-discussion/206627-sr20det-engine-upgrade-guide.html