Not sure you want a 50MM Scope - the mount might be too high for comfortable shooting. In most cases, a 42 or 44mm Objective lens collects about the same light, and allows for lower scope mounting. I have a Simmons Aetec, 2.8-10x44, I really like, and it's plenty bright.
www.natchezss.com has some killer scopes.....I'm looking at 1 4-16x56 Mil-Dot fer 119.00 I believe its a Leapers scope, but they have TONS of scope's....plus they have some re-furb 1's also.... I just got the catalog yesterday and its got good stuff in it!!!