My computer is a souped-up Quicksilver G4. It has a 1.33 GHz G4 upgrade with 2 MB of L3 cache, a Radeon 9800 Pro (although that benchmark was done with a GeForce 3 installed before I got the 9800), 1 GB of RAM, a DVD-RW drive, and two 80 GB hard drives (one 8 MB buffer, one 2 MB buffer).
If you have a 700-800 MHz iMac, it would be an excellent upgrade. Decent even with a 1 GHz. For the 1.25 GHz... I'd say wait for Rev. B, then buy. The main thing setting my computer apart from yours is the L3 cache on the CPU, and the faster hard drive. Those two make a big difference - upgrading from a 7200 RPM drive with 2 MB of cache (now my secondary drive) to one with 8 MB of cache has made everything noticeably quicker. Not a huge improvement, but enough that I can actually tell the difference. And L3 cache also makes quite a difference. iMacs don't have L3.
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