well, the gearbox from any F or H series Honda will do for you nicely. The boxes from H22 (eg M2A4) have shorter gearing than the F series equivalent and if you look hard enough you can find some (eg M2B4) with factory LSD (big help in solodex)
You would also have the knowledge that you good to go if/when you do a swap to the H.. Maybe the gearbox would be enough to bring out the potential in your F20 though.
That being said, I have been amassing the parts for a manual swap myself.
So far, I have the shifter and cables, trans mount, pedals (all sourced in the US). Still need the gearbox itself, all the hydraulics and an intermediate shaft, CV joint and ECU. Will get it all done eventually but cash a bit tight at the moment.
Please let me know how your pricing of gearboxes goes. You can post here or private message me. Maybe if the prices are ok I can finally buy a gearbox
This thread may be of some use to you
http://honda-tech.com/showthread.php?t=2548441