RE: Whats the best site for around $50?
I like the looks of the new PSE sights. All metal construction...graduated adjustment bars, etc... They have the staggered pins though IIRC so they are not as failsafe, IMO, as the single plane-zero pin gap setups but I would still recommend them.
My vote goes for the Copper John 3 pin Deadnuts hunter. $50 in my neck of the woods.