I'd be careful with SysSpeed. I just tried it and it said my FPU was 476MHz (actually 33MHz). Then it gave some very strange results - saying my drive speed was 1000 times slower than an Amiga 2000 (I've got a 5400RPM drive!). In the program, the About window and MUI prefs would not come up and when I tried closing the program, my system crashed.
I think I'll stick with AIBB.