Are your beagles puppies still or are you looking for adult formulas?
I like the bison and salmon Solid gold. They are the tastiest. They have one for little high energy dogs but it's a bit expensive (Just a Wee Bit). (It also has 27% protein and 18% fat, so it should only be used for really, really active doggies.) I think it's ok to feed the large breed one (Wolf King), I can't see any huge difference in ingredients but the calories, fat and protein are a bit lower in the large breed one (so if they aren't really, really active, it might be a better choice).
Here are the two:
Wee Bit
Wolf King
For Wellness.. I know some doggies who don't like it, so if your doggies are picky, I say stick with the fishy one.
Wellness Fish and Sweet Potato