If this is just for music playback, I would attack it a different way buy a center for the aperions and an affordable subwoofer and turn that system into a decent HT setup.. Then build a nice system just for music...
A decent set of bookshelfs and a nice pair of subs with a simple short path dac/amp setup...
FOCAL PROFILE 908 DIAMOND BLACK (PR) at Music Direct
Dual SB12-NSD
this bundle
MUSICAL FIDELITY M1 SDAC & M1 PWR BUNDLE at Music Direct
1 more of these amps
MUSICAL FIDELITY M1PWR POWER AMP at Music Direct
1 of these
MiniDSP 2x4 | MiniDSP
So that will cost you just a few hundred bucks more than the focal bookshelfs MSRP and you get an entire 2.2 system, I have experience with the 908's and they play very very well, they are also really easy to place in a room and very forgiving... And having subs vs towers is giong to do many things for your system, it will give you a better range {subs play lower than any tower I have heard}, it will allow you cross your bookshelfs so they only get say 85hz and above, since the lows hz are the more difficult freqs to reproduce {power wise} your main amps will not need to be large at all, the m1's put out 100w at 8ohms bridged mono which will be plenty to match the svs internal sub amps, having two subs will even out the room response, the mini dsp will handle all of your sub integration, it will be an all around impressive system...
Keep in mind the non sale prices of this gear, if you bought it a few months back you would be over $9000, I own one of the m1 amps {they are very nice}, I own a pair of the svs subs {one of my favorite sealed subs}, My brother owns the focal books with a matching center {very musical bookshelf}, and I have played with that dac preamp in my local shop... ALL REALLY NICE GEAR...
So keep it in mind, buy once cry one, sell or turn your gear into a nice HT system and start fresh with something impressive rite out of the box... Ill bet if you called musicdirect and told them you were buying the 908's, an m1 bundle and another m1 amp they would cut you a deal, and then Ill bet SVS will knock off another $75 off the price of the sb12's in piano black, since they are trying to sell them off... I am thinking you get that entire system for around $3500 think about it, thats not much more than you are prepared to spend on a dac.... And you will have a mono block powered{no cross talk, if it were an issue}, 2.2 system with dsp controlled crossing, and a pretty short signal path, that will be really forgiving to things like room acoustics and speaker placement, plus be capable of some pretty impressive output, the 908's are around 88db I believe so with 100w each and crossed around 70-90hz they will be able to get loud, plus add in the fact that you would have 1600 dynamic watts of subwoofer with it this system will shame your current towers in all aspects....
PS with them subs the mini dsp wouldn't be mandatory, the subs have an internal 80hz high pass output set of rca's that you can use to feed your main amps, it works well but the mini dsp would give you adjustments, although you will most likely end up crossing at 80, so I would be on the fence about spending the extra 100 on a dsp...