If you don't mind reloading I would recommend a between-the-wars boxlock. They usually weigh just under 6 pounds and are a delight to carry. They would typically have 2-1/2" chambers and be proofed at 1oz. Three thousand ought to be plenty for an extractors and a little engraving. The contemporary British standard load for this gun was 7/8oz.
If you want to shoot Walmart shells the Webley and Scott 700 series would be a great choice. I would shoot the factory 1 ounce 2.5DE load in them. I would expect if you took your time you could find one to fit your budgeted number.
Best,
Mike
Last edited by AmarilloMike; 02/05/10 12:51 PM.