PC2700 will make a difference, not sure if it will for compiling, but for overall system performance gain, it will... As far as the CPU... You can get a 2100+ tbred B from newegg for under $80, I don't know if they ship to the UK though... But that processor can be overclocked to 2700+ speeds without too much trouble, provided your motherboard is capable... I have that CPU with an EPoX 8K3A+ (KT333) and have it stable at 2700+ speeds.