ASUS M2N-MX is one model ~£45 an NF430 with 2g fsb, 10/100 lan and 5.1 sound, 4g limit.
ASUS M2NPV-VM is another ~£55 an NF430 with 2g fsb, 1g lan, tv out stuffs DVI svid, 8g limit, firewire.
U can go to ~£30 (lower fsb) or go as high as ~£70 (with gig lan & 7.1 sound, some with wifi)
If u want to go cheaper again u could think socket 939, but as u know it`s older tech again, but athlons cheap cheap atm for these as they phase out.
Some Gigabyte offers on this page, which is open til monday (no idea what gigabyte boards are like, I can somehow feel Frag`s blood-pressure rizing tho >.<)