So much down to personal preference and the type of music you play. I’m currently running a Numark PPD01. It’s great for me as the crossfader is pretty decent quality and there’s a bunch of effects on there. Plus, it’s digital so actually sounds pretty crisp.
But, I’ve had Gemini and Vestax in the past and have been impressed by both, in different ways. I think it’s more a question of you get what you pay for. I’d definitely recommend Vestax, though, if I had to go with one of the three brands I’ve used.