8800GT power supply

he is running a 3.0 GHz P4 HT (LGA775)probably why he has that 50w extra
i think thats wht killed the psu the most a big electricity eater that the p4s are and also leaving it on all day and night which i think cuts the lifespan by half lol

Antec wouldn't be my 1st choice either but you can't beat the price/power ratio (amperage, not wattage).
PC Power and Corsair are what I would prefer.

All good points. I guess i am in the "i would rather be safe than sorry" camp.

Sorry if this is necromancy....
but I'm getting a new computer next week. Specifically an HP m9100z (Sorry but it won't let me post a link.)

Athlon X64 6000+ dual core 3.0Ghz
2GB DDR2-667MHz dual channel SDRAM (2x1024)
---I plan on upgrading to 3GB with 2 sticks I have laying around from my old computer.
128MB NVIDIA GeForce 8400, DVI-I, VGA
---Hoping to replace this with an 8800GT.
350W PS (I can't find the specifics on it)
320GB 7200 rpm SATA 3Gb/s hard drive
802.11 b/g USB Wireless LAN card
LightScribe 16X max. DVD+/-R/RW SuperMulti drive

My question is this: Will I need to get a new PS for an 8800GT? I don't really like the idea of tearing out my computer's heart as soon as I get it, but if I have to, I will. I don't plan on overclocking anything.
Also will this card even fit in my case? I've heard it's rediculously long.

Thanks.

Yes a new PSU will definitely be needed.

As stated above yes new psu. Comes with a 350w.

http://www.shopping.hp.com/series/category/desktops/m9100z_series/3/computer_store

Wait till you get your system and measure inside your case.
Card is 9" long plus another inch needed to plug pcie cable in.