For 25k I suggest:
CPU - Intel Core 2 Duo E5200 (P 3,670)
Mobo - Asus P5QL Pro P43 (P 5,020)
Memory - 2 x 2 GB Kingston ValueRam DDR2-800 (2 x P 1,350)
HDD- Seagate Barracuda 7200.12 500GB SATA (P 3,020)
ODD - Samsung 22x SATA DVD+-RW (P 1,400)
GPU - nVidia 9600 GT 512 MB GDDR3 (P 4,370)
PSU - Corsair CX400 400W (P 2,700)
Case - Kahit ano (~1.7k)
Total Cost: P 24,580
* Prices are from PCX website
Kung sobra talaga yung 25k for you, you can take out the branded PSU kasi may kasamang generic PSU yung mga case (i recommend against it though, see here why:
http://www.hardwaresecrets.com/article/534)
Also, you can get cheaper boards, kasi di ka naman magooverclock. For a cheap board you could get a Gigabyte GAG31M-ES2C G31 for P2,700.
That would reduce your total cost to P 19560. I still think the extra 5k is worth it, though.
