The Junior Playa' (15,000)
The Junior Playa' is a low-end gaming rig. You can play legacy and previous generation
games without a sweat, and the latest games with a few eye candy disabled. This is just
the Recession Rig stuffed with a beefier RAM and GPU.
[spoiler]
Processor: Athlon II X2 240 @ 2595
This is a no-brainer. The 240 is probably the best processor you can buy @ 2.5k.
At this price point, you won't be rendering 1080p videos or editing 4k vids.

But then again, you can enjoy the merits of having a procie with more than 1 core.
Motherboard: ECS A740GM-A @ 1995
This board is packed up with the necessities you should see in a budget/entry-level board.

You can see a brief review
here.
GPU: Palit 9800GT Green Edition 512MB @ 4095
This is the Green Edition of the 9800GT as manufactured by Palit. If I am not mistaken, it does not require
any external power source.
RAM: Kingston Value 2GB DDR2 800 @ 2050
The only RAM you can buy to fit within the 15k price range and still pack a punch for the said segment.
HDD: Western Digital Caviar Blue 320GB @ 1795
It is unreasonable to recommend a 250GB or 160GB HDD when they differ only by a hundred pesos.
WD is just a personal preference, a Seagate Drive is fine too.
ODD: Any dual-layer DVD drive @ 1000
'nuff said.
Casing: Any generic casing @ 1300
'nuff said.
PSU: Included in the casing
'nuff said.
DISCLAIMER: getting a decent PSU is recommended. (cheapest @ 2-3k)
TOTAL: ~Php 14830.00
Alternatives: Intel E5300; Asus P5KPL-AM.