Newbie warning, so be nice.
Alright, I haven't been into overclocking since I got my celeron 333A so many years ago.
I've been reading up and trying to understand how all these different settings come together to get your CPU and memory speed.
I have a winchester A64 3000 1.8 stock...
See if there are any hobby shops or stuff like that. Sometimes they'll have ads. or be able to put you in touch with someone who does custom airbrushing. Or try a college art school. check their bulletin boards. I'm sure you'll be able to find a starving student that does airbrushing.
I've got 3 HD's, 2 optical drives, 1 floppy, Tv card, 9800np and 4 case fans running on a 365watt enermax PS.
You should be fine with the 300 watt as long as it's a decent brand.