[Marc-OS]

I think you should go with the 90-91 CRX, but the model is another deal. If you're planning a b series engine swap you might want to go with an HF because it's the lightest but has the weakest engine which doesn't matter if you're swapping. But if you plan on stickin' with the d16a6 or maybe are thinkin' of a d16z6 or d16y8 you'll probably want the Si because the tranny bolts right up with the other d series and has the best gearing, and the wiring is a lot easier for when you change ECU's.