The bench corkers are really the best for corking your wine. The Portuguese corker has a plastic iris that pre-compresses the corks. The handle that pushes the cork into the bottle is adjustable so you can control how far the cork is inserted. The bottle locks into place as you are corking to keep the wine bottles in place.
The floor corker is the only way to go if you make a lot of wine—it's practically indestructible, extremely efficient, and will save you a ton of time.