i use to buy my pc stuffs sa rsuncomputers & pcexpress & pc options. check out:
http://www.rsuncomputers.com/
http://www.pcx.com.ph/

these are in shaw boulevard kung malayo ka sa gilmore.

right now nagbabaan yong mga dual cores due to introduction of the intel core duo, so i suggest you get them cpu at reduced prices. Intel or AMD? If you're getting the new core duo, then i guess Intel na lang, good reviews sa net. If not, i'd get the AMD X2 4400...laki binaba nya.

you can also google AMD vs. Intel..