Thread: Setup Power Question

Just wanted to get an opinion from some of the more knowledgeable ppl here.

I have the following setup as a 'project pc' that's not really used much anymore. I would like to place it in my Mazda 3 but I'm not too sure on the PSU I'd be needing to power it. I've been told to stay away from an inverter if possible...

Setup
Mobo: MSI P6N 650i ATX LGA775 Intel
CPU: Core2Duo T8100 (It's fairly new...)
Vid: XFX GeForce 8600GT PCIeX16
Sound: On-Board Audio ( for now.. )
Ram: 1GBX2 Kingston DDR2 800 240-Pin
Hard Drive: Seagate Barracuda 400gb sata ST3400620AS (I think... It's newer too)

I plan on having a few usb devices play it safe and say 4. I want to run at least 1 ir cam and possibly another backup cam. That's for future install though.

Note: I also have an old 250gb Laptop sata drive I pulled about 6months back. I don't have the model info on it tho.

The following psu calculator set the recommended level at ~250. This seemed low to me. I did look for my docs for the various parts listed above but they hav been lost in the trash can
http://extreme.outervision.com/PSUEngine

I was looking at the Opus 320Watt PSU but still that seems low as the Power Supply in the PC at the moment is sitting at a comfy 500Watt.

The reason I want to try and stick with my parts listed above, save the fact I already have them for free, is that I run a beefy install of Ubuntu on it and would like to keep that as my CarPC interface. Saves on install time. Plus it just works and looks bad ***

Any feedback is appreciated!
Thanks.