I've owned both, an 89 DX hatch and an 89 Si CRX....I definately prefer the CRX. It's drivability was tons better. Plus CRX's are, for the most part, less common (compared to hatches atleast).

There is a wealth of aftermarket items for hte 88-91's. Just ask for what you need and I'm sure someone here can point you in the right direction.

As far as swaps, Im a ZC guy. Easy to install (plug and play unless you have a DX then you have to do the DPFI to MPFI wiring). I've heard from alot of the b16er's that they wish they would had forked out the extra $$ for the b18. Of course that's just an opinion. To each their own!!