Need advice for first SFF

[Sparkdos]

Hey, I've been looking into getting a small form factor pc for quite some time now but always been worried about heat and psu issues. Apart from this ive never need the expandability of a full tower and i've been going to alot of LANs its getting abit to big to carry about now.

After much consideration I was thinking about getting a Shuttle SN21G5. This comes with a 250w silent-x psu. I've looked and these power supplys seem to be able to run a whole lot but I would like some input if it could run my system. I've done a PSU calculator my stuff comes out at about 258w but looking ive seen people loading these upto about 300w.

Spec as follows:
A64 3500+
2x1GB Ram
7800gt (it reference design single slot cooler)
200gb WD drive or 2x36gb raptors (depending on what it can handle)
DVD-RW

I've got all those components already they just want a new home. I've got £220 to spend i have also been eyeing up a qpack (because i already have a mATX board) but i really like the size that the shuttle can offer. Any comments and/or suggestions are welcome but i cant go over the £220 budget.

Thanks alot, also sorry for the long post full of noob questions hehe.

 

[Dillusion]

Shuttle PSU should work fine, those things are troopers; can handle anything. Specs seem fine too. What mATX mobo do you have laying around may i ask? Maybe its just better to grab an mATX case for it.....Theres nothing wrong with a shuttle, though.

 

[Sparkdos]

Its a cheap Foxconn Winfast mATX board (NF4XK8MC), its work fine but theres no voltage changing options anywhere to be seen. Not that i would be overclocking anyways.Thanks for reassuring me on the Shuttle PSU . Hopefully I should be able to get the SN21G5 by wednesday *fingers crossed*. If the 7800gt is too much for it I'll probably just swap for a 7600gt and some cash.