Hmm. I like the sound of that, Admiral. I'll have a look for it.

The best I've found so far is the ASUS A7N8X Deluxe: nForce2, dual DDR400, USB2, Firewire, Dual 3Com LAN, AGP 8X, Serial ATA-150, nVidia Soundstorm audio, C.O.P. (CPU Overheat Protection) circuit, Q-Fan technology (automatically adjusts fan speeds depending on system load), 5 PCI slots.
This costs just under a hundred quid, but I think it's worth it for the features and performance, and the reviewers seem to like it a lot. I might go for this...
I'm not really keen on Gigabyte, to be honest - the quality of my current (dead) one doesn't seem that high, and I don't want to pay another £100 just to have it fail on me again. Also, their technical support isn't exactly marvellous, which has made it difficult for me to find help in the past.
JC: I'm looking at the Northbridge heatsink from QuietPC, and possibly their Flower Cooler for my new CPU (probably an Athlon XP 2600 or a Barton XP 2500, depending on what I can afford to pay), because they're almost silent. I'm also gonna get two 92mm fans for the case to cool the thing down, along with round IDE cables to let the air move.
Or, I could go
really over the top, and get a dual CPU mobo with two Athlon MP 2000's...

.....though that'd be a bit expensive. I wouldn't be able to buy them for about three months, which would leave me stuck on this iMac with no games.
Whaddaya think?