Out of those I like the Pioneer or Numark the best. It comes down to cost your buddy wants to spend. My friend has his whole library already in Serato, and he eventually bought Video-SL when he was using time-coded CDs which worked amazing. He has now been playing out with the Reloop Terminal 4 from Serato (4 channel MIDI) and it easily incorporates his videos as well. May be another to at least look at.