Susan Bates hooks. I never have any problem crocheting with splitty yarn with them, and never drop a loop. They come in a million different sizes and are pretty easy to find. I DON'T think Walmart carries them, but I know A.C. Moore does. If you can't find them, let me know and i'd be more than willing to send some out your way.
Sizes? Well, for afghans and things, I tend to stick with a K hook. It's a nice size, and works pretty fast, though check with your pattern to see if it needs a specific size. It seems to me that most projects use an H hook. I have about a million of them, and yet can never seem to find one when I need one.
Basically, if you're using worsted weight yarn, stick with an H-K. The smaller the hook, the tighter your work will be, larger will leave bigger holes.
Hope to have helped