I recently purchased a desktop pc which has an integrated video card and 250w power supply(HP Pavilion a6110n, specs posted below). I plan on doing some gaming in the near future, so upgrading the video card seems like a good idea. Basically I'd like to upgrade to a decent card with GDDR3 capabilities that can take advantage of windows vista, but everything I look at requires more power than my psu is capable of. An HP technician informed me that my pc is upgradeable to a 460w psu. I'd like to know if most power supplies are universal, or if I need to order a specific one. As for the video card, I'm looking for something with the best performance/price ratio, and something that my new 460w psu can handle as well.

Here are the specs:

Base processor
Athlon 64 X2 (B) 4400+ 2.3 GHz (65W)

Video Card
GeForce 6150SE nForce 430

Motherboard
Manufacturer: Asus
Motherboard Name: M2N68-LA
HP/Compaq motherboard name: Narra2-GL8E

Memory
Component Attributes
Memory Installed 2 GB
Maximum allowed 8 GB (4 x 2 GB) (64-bit OS)
4 GB* (4 x 1 GB) (32-bit OS)
PC2-5300 MB/sec
Type 240 pin, DDR2 SDRAM
Hard drive
320 GB SATA 3G (3.0 Gb/sec)
7200 rpm

16X DVD(±)R/RW 12X RAM (±)R DL LightScribe SATA drive

Expansion slots
Slot type Quantity
PCI Two (One available)
PCI Express x16 One (One available)
PCI Express x1 One (One available)

there is a link to full specs from here:
http://www.shopping.hp.com/webapp/sh...GG781AAR%23ABA

The computer itself was $400 after shipping, so I'd prefer not to go over $200 for the new card and power supply combined. Thanks in advance!

From the looks of things (see attached pic) the P.S. is of universal architecture. So a higher wattage supply shouldn't be a problem. (As long as all P.S. connectors match your motherboard/devices etc.)

(Pic taken from direct HP link for that system)

http://h10032.www1.hp.com/ctg/Manual/c00841410.pdf

Make sure the PSU has SATA power connectors, but you could always buy adapters that hook onto molex connectors.
Also PSU's are advertised at thier Max Power ratings. So always buy one that will exceed your need. You don't want it to try to push it's maximum wattage while you're playing a game for hours at a time. And remember, you usually get what you pay for.
As far as video cards go. You mentioned you are running Vista, so you want something to support DirectX 10. I recommend a GeForce 8800 GT if you're wanting to spend that kind of money on a video card. If you're looking for something a little cheaper, go with the 8600, or even 8400. Go here to learn more about Video Cards http://www.tomshardware.com/2006/07/...ics_beginners/
A good site to buy from is Newegg.com, that's where I buy my parts, and they are cheap, quick, and fair when it comes to returns and what-not.
Good luck!
P.S. Make sure you have plenty of fans to keep the new card cool.