Serato only DDJ-SP1 became the rekordbox only DDJ-XP1, which in turn has just spawned the dual fuelled DDJ-XP2 for rekordbox and Serato DJ Pro.
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Numark take their NS6, give it a software transplant and a paint job. Behold the Traktor specific Numark 4Trak. Chris Cartledge has a go.
iPad and controller get it on and have hybrid lovechild - that's what the Anymode PDJ looks like to me.
The new Pioneer DJ DDJ-XP1 is the SP1 update you've been waiting for. Except that it's for rekordbox and not Serato DJ, and comes with the new rekordbox 5.
The American Audio ELMC-1 sneaks in at that level just below entry level and offers the most basic of controls for fledgling DJs for just $99.
If you're going to use software, it's a safe bet that the hardware designed for it is going to be pretty hot. Such is the case with the Ableton Push. DJWORX teamster Darren E Cowley of Isotonik Studios impulse-bought one, but after the shortest play ended up boxing it up and putting it on to of a wardrobe to do house renovations. But having dug it out again, he sees what all the fuss is about. Here is his very detailed review, with a second opinion from Mark Settle.