Ok so im going to piece my B16A2 swap together rather than buy a complete swap becasue i already have the longblock. Im looking at ECU's

Which should I get P28 or P30....What are the noticeable differences?

And what are the differences in Skunk2, Mugen, and Jun Spec chipped ECU's
I found them on here... http://swapshopmotors.tripod.com/id11.html

Thanks

Swap is goin in 89 CRX HF
And if there are any better places to get an ECU from please let me know...