this is very subjective to be said, but since you ask:
Honestly, I don’t it’s a right setup for 2011. Let me give you some background, so you can understand why I’m saying it.
I was Djing commercially between 1996-7 and 2000. in 1998 I started CS education and shortly after that I had to shift my life away from the club life (money, time, night life vs day focus). In 2003, I got a good IT job and decided that I can look back at DJ-ing, but as a hobby this time. I started to collect some second hand gear to start with and got a Gemini turntable, a CDJ-500s, a Tascam CDJ and a 3 channel mixer from JBSystems. I also got a stupid Hercules DJ Console MK1 when it was the first compact DJ controller for computer DJing. I still own these, but they just collect dust.
In 2008 i had more cash and decided to built a new setup, very similar to what you are after. I also thought that I want to be able to play both with and without computer, so I got a pair of CDJ-400s (the only one with USB/HID/MIDI at that time). A nice 4 channel Vestax PMC-280 FX mixer and put all that in a RoadReady coffin so they are compact and easy to carry from party to party. I also got a pair of 32GB USB/SATA SSD drives to use with the players without computer and without the need to burn CDs. It was a perfect Hybrid setup for analogue and digital performance!
So far so good but it appeared that I always prefer to play on TraktorPro and 98% of the time, I’m using the CDJs for controllers only. I then decided to get a Traktor Scratch Pro with the Audio8 to expand my setup with timecode. That was mid last year (2010). When I started to accept the idea to invest more, I also started to have doubts. I was feeling that the coffin is too large and heavy to carry on parties. It was simply not convenient enough and I often didn’t want bringing to parties, simply because of the logstics - always need to look after the damn heavy and expensive Case! Adding the TSP would have make it more functional, but not more convenient. I realized that it won’t make me happy, so I started looking at controllers and realized how cool the VCI-100 is. It was actually capable of all I was doing with my CDJ setup and even more, because of the DJ TT mappings. It can also fit in a backpack, which is all I wanted!
At the same time, NI teased the S4. Once I saw it, I realized that it’s all I want. Once the S4 was available in Nov, I went to a shop to try it and confirmed it’s awesomeness. I’ve put my CDJ-400 coffin on sale and sold them in the beginning of Jan. I can now say the S4 is more then perfect!
so bottom line is look for controllers. Don’t burn your hard earned money on expensive Pioneer gear. Since you have the DDM, get some of the controllers from my post above. Not to say that for the price of just one CDJ-850, you’ll get the awesome S4. It’s the most practical & creative controller and bundles the best software to use with.
There’s simply no point in investing in CDJs, when it’s all so computerized these days. Especially if you seek advise on this forum 