No. The Q8200 is terrible - aparently not enough cache, not OCable enough and doesn't support intels virtualisation technology. As for good PSUs < £25 I don't think there are any TBH. Decent PSUs that will power your machine start at about £30. As a rough guide
Antec basiq 350W - £28.40 -ebuyer
Silverstone ST35F 350W - £32.14 - scan
OCZ stealthXstream 400W - £34.99 - ebuyer