Hi, I have 2 16b Brit guns. A Charles Boswell 2nd Quality and a Webley & Scott Model 500. Both are just wonderful to carry and hunt with. These two are my favorites. They each weigh in at 5lbs 12oz. While light in weight, they are so well balanced they are not whippy at all (to me at least!). I wouldn't trade or sell either of them.
I use only 1oz low pressure loads from RST and New Era Ammunition. These loads kill birds just fine. From Sharpies to wild Pheasants'
I also own 3 light Brit 12's. Great guns, but there is a very special place in my heart for those 16's.
For the money you want to spend, you should be able to find something you'd be happy with.
Here are a couple of site that may have something of interest:
http://www.vintagedoubles.com/index.phphttp://www.hillrodandgun.com/invent.phpGood Luck and remember most of the fun is in looking!
All the best!
Greg