When my wife (5'3" 110#) was shooting a 20ga, she went through a lot of Winchester AA target loads (2 3/4", 2 1/2 DE, 7/8oz, #8 shot). Winchester catalogs these as "AA208".
They never gave her a problem, even though she was shooting them out of a pretty lightweight Benelli M1 (not exactly known for reduced recoil).
As an all-around clay target buster, I tend to like #7.5 or #8 shot over the smaller stuff. #8.5 works well, but can fail on longer shots and some rabbits (I've got a rabbit on my dresser right now that has a single hole directly in the center and 4 tiny non-penetrating chips around the edge -- I didn't get credit for it, since none were identifiable as it rolled).
If you think you might reload at some point, I'd spend the extra bit and use Remington STS shells. The hulls make for good reloading and the factory stuf performs well. Also, it may be a purely subjective thing, but I truly believe that comparable Winchester loads tend to have more felt recoil. I don't know why, but I can almost always tell when I've just touched off a Winchester shell.