So I finally have a new desktop, the one I was previously using was terrible. I can now actually play a Byond game without the computer spazzing out on me.
Motherboard - ASUS P5LD2
CPU - Intel Pentium D 2.8GHz Dual Core
Memory - 4GB DDR2
Graphics - GeForce 8800GT
Monitor - 19" LCD Hannspree
Cost - £200
I'll most likely put this monitor in the other room and take back my 22" one, but I'm a happy guy.
Time to test out Teridal and Feval to see if I've overcome the lag issue that stopped me from playing them previously.