I doubt that "blues" are hybrids. Unless you worry about the bgills overspawning and stunting, hybrids offer no actual catchable size advantage. Only bluegills offer a renewable source of protien for the catfish.

Of course, if you plan to feed daily, catfish and hybrids can be an acceptable mix. Even then, I would have to add at least some bluegills and shellcrackers. Wouldn't hurt to occasionally get a pound of fatheads.

However, I think the best bet is about 2 pounds of fatheads, 300 bluegills, about 50 shellcrackers and 50 or so 6 to 8 inch channel cats. Add a couple of kids to keep the bluegills whipped down and you should have a good mix. A feeder puts a lot of size on the cats in a hurry.

Add some brush for small fish cover.

Generally, the fish guys don't deliver. You pick up your fish in oxygenated plastic bags and add them to the water yourself. Bill Cody recently had an excellent post on the right way to add fish to a new pond.