I'm a fan of Wiese's GFA hopper. I think the fact that the body isn't doubled over helps with hook ups.
http://www.youtube.com/watch?v=juofPgOpic4
I use a tan body with yellow thread.
Au naturel...I like A.K.'s hopper....basically a Dave's hopper without the legs or red tag. I generally use a yellow body on this fly (kind of classic).
Size 10 2xl seems to work well for hoppers on Wisconsin's spring creeks.
Size 12 2xl in shades of black and brown make for dandy crickets.