Thanks to everybody reading and replying to this. Update:
I need:
at least 5 SATA ports
Gigabit LAN (most tend to have this, right?)
DDR2 ram slots
can be ATX or mATX (PCI slots not an issue)
AM2+ or AM3 (for the Athlon II X3 435)
I WANT:
6 SATA ports (for future expansion)
4x DDR2 ram slots (future expansion)
6+ USB ports at back
Ability to (potentially) unlock 4th core (ACC)
And all this for less than £90. Not asking for too much, ja?
Now having done some reading, I'm wondering if the AMD 785 chipset or the 790 is better. Apparently the 785 is newer...