A lot depends on how much you want to spend and whether you're going new or used. A new Spanish SLE is approaching 5 figures. Used ones are probably to be found in the mid-4 figures range. BLEs are cheaper, but lack some of the aesthetics. There are a ton of British SLEs in 12 out there and you can probably find one in your weight class in the mid-4s range, but it will likely have 2-1/2 inch chambers. British 20s are much less common. If you can live with the styling, there are a fair number of Germanic BLEs in 20 gauge available, most for under $3K. And there are some wonderful Italian sxs 20s out there, but they are likely to be pricier if you are trying to find one that is under 6 pounds.
You have to decide what you want, how much you'd be willing to spend to adjust things like LOP, chokes, etc. if you find a gun you like that needs to be adjusted to fit you and your intended use.
As an aside, short barrels (25-26 inches) are out of fashion these days, so you could find a gun so equipped for less than the same gun with 28-30 inch barrels and if the primary use is grouse, that might even be an advantage.
Look around a lot, handle as many different guns as you can and then make a decision.
Good luck with your search. It's a ton of fun.
Rem
