@Clark Kent
Cyberstorm MKIII works very fast although 060 socket solder points are fragile and could produce bad contacts in the future. Anyway you can also add a CVPPC, a very fast graphic card. If you are lucky you could also find G-Rex, the fastest PCI bridge.
CyberstormMKII is very nice and quite fast, I was very happy with it when I had it.
Cyberstorm MKI can be picky with memory used and uses various modules that could cause contact problems if you are not careful. IIRC these are not easy to overclock but I may be mistaken.
IMHO SCSI is still important because there are cheap scsi-ide/scsi-sata controllers that allow you to have very fast HD access. Yamaha ones are quite cheap (although limited to 128GB) and ACard ones are faster and moreover: allow more than 128GB to be used.
There are also GVP accelerators that also have quite fast memory access (faster than MKIII IIRC) but I don't know many GVP users. I think these accelerators are built new again so if you don't mind paying more you may have new hardware for your classic :-)
