You could consider a Benjamin EB22 or even better an EB17
Made in America and all metal construction - mainly brass. No plastic.
Noisy (love it!) with a slightly crude trigger but compact and accurate. Up near the legal limit power wise too.....
EB22 (.22) still available new for about £150. EB17 (.177) available used from about £65 for a good one.
If I could only own one single shot pistol then I would find it hard to choose between this and an HW45. Considering the quality and excellent shooting characteristics of the HW45 thats saying something.
Well within your budget.
http://i90.photobucket.com/albums/k2...n/DSC06038.jpg