Reply to Xone DB2 vs 4D - odd choice, help needed!

Hi all,

I am considering buying one of these A&H products/combos as my new controller-mixer-soundcard setup for Traktor Pro 2.

The prices are probably a little different from what may be available elswhere hence I really your thoughts:
DB4 for $2,550
DB2 for $1,750
4D for $1,450
42+2D for $1,280
32+2D for $1,030

I'm most keen on either the DB2 or the 4D and this is how I see the differences for me:

DB2:
- The fx are HUGELY attractive
- Is it a good MIDI controller? I will try to use it to browse and load tracks, and for all transport functions on all 4 decks. Possible?
- Are the filters the same quality as those on the 4D?

4D:
- I lose out on the DB2's fx, which I presume are far superior to using Traktor's internal fx (?)
- Ample MIDI control and I can map everything including Traktor's internal fx

DB4 is great but very pricey and not sure if the extra $700 is worthwhile for me, while the 42 and 32 combos with the 2D are very appealing for my wallet!

I need to make up my mind soon. So any help is greatly appreciated. Thanks!