I want to start on Turntablism (Scratch DJing), like the kinda stuff done by Sid (Slipknot) or ST1TCH (Mushroomhead).

So my question is, which is better, CD players with Jog Wheels or Vinyl Turntables?
I already have a bunch of CDs, but if vinyl is easier to work with/better quality I'd get some records.

The main kits I'm looking at are these:
http://www.amazon.com/Numark-CD-DJ-Box-Complete/dp/B002M8CACO/ref=sr_1_7?ie=UTF8&s=musical-instruments&qid=1259527531&sr=8-7
Or
http://www.amazon.com/Numark-DJ-IN-BOX-S7/dp/B000FVUKFY/ref=sr_1_3?ie=UTF8&s=musical-instruments&qid=1259528273&sr=8-3
Or
http://www.amazon.com/Numark-BATTLE-Complete-Turntable-System/dp/B00009W5HU/ref=sr_1_2?ie=UTF8&s=musical-instruments&qid=1259528273&sr=8-2