I built a q6600 system in november last year, it would cost more today to source the parts (cpu was £117, now ~£150)...same with the e5200 and e4300 machines for xmas
Prices are going up

Only component which has seriously dropped in price since buying is my 9800gtx...cost £220 in June..now worth a tenner...the rest of the PC (q9300 etc..) is about the same price
so...buy while you have the cash, if prices do drop (unlikely) so what? You've bought the PC you want at a price you can afford, and if they go up (likley) you can sit smugly