Kongs seem pretty good and we have 3 buster cubes now. I love the buster cubes and so do the dogs. Hawk will spend hours kicking his around trying to get treats out of it. Kinda loud on the concrete floors though.
I just got some nylabones (sp?). They're ok, but the dogs aren't exactly wild about them. I'll probably stick with just getting real bones from the butcher. Our butcher keeps 3" to 4" bone cuts in the fridge. I like these because the reason dogs chew on bones is to get to the marrow. The problem is that chewing a real bone wears down the teeth. A short cut bone lets them get to the marrow and still do a little chewing. I'll generally trash the left overs after a week, two weeks at the longest.
Rope tugs are fun. I'm talking about real sail the 7 seas rope. Just tie a few knots in it so you can hold on and have some fun. A 3" length with knots works pretty well.
My dogs love to surgically remove the squeakers from toys. You can boy the squeaker on its own at hobby lobby or from Amazon. Then go to yard sales, buy old stuff toys and put the squeakers in them. Much cheaper than replacing the insanely expensive stuffed toys at Pet Smart. Just need some needle and thread to do this. (amazon squeakers:
it's even on prime!)