Depends on what type of tuner you're replacing - personally I like to use the screw holes for the original tuners if at all possible, so I can get the guitar back to original condition if I decide to sell it.
If they're full-size Grover Rotomatics, Gotoh SG301s will fit the existing screw holes, so will Planet Waves. Sperzels will need new holes drilled, and they won't hide the existing holes either.
Were you planning on getting locking or regular tuners? If you're not going for locking, I don't know if it's worth replacing the Grovers. All the brands mentioned are excellent, but I wouldn't say they work any better than the Grovers. Unless you want to change the look or reduce the weight.