Is pre-amp getting killed?


Hi,
   I'm in the market for the Pre-amp and DAC. I had the PS audio Stellar Gain Cell DAC/Pre-amp combo and I sold that to go separates. I thought of buying PS audio Direct Stream DAC and Audio Research REF 6 Pre-amp. I started doing research and spoke to few dealers. Below are the recommendations I got,

1. Bel Canto EX DAC
2. Simaudio 390 Network Player/DAC

3 dealers I spoke recommended to go with Pre-AMP/DAC/Network player combo instead of separate Pre-amp and DAC. Is pre-amp's are getting killed by the combo? 

Any thoughts?

karurravi
I now now use an MSB Analog DAC with volume control and upgraded MSB power supply instead of my preamp. Sounds fantastic. I would think that “less is more” when it comes to the signal path, so because eliminating the preamp takes more cabling and electronics out, there is less to affect the signal...
My experience with using a DAC to drive an amp is this 
had a pair of vandy 2 with a Rogue cronus mag up graded my speakers to Quatros so I had to have a high pass filters put in to my integrated amp so while the guys at Rogue did their thing I borrowed an Aesthetix Atlas and drove it with my Ayer Codex both very respectable components used them with the Quatros sounded excellent then I got my Rogue back hook it up and the sound was astounding the different between the two was absolutely astounding you would had thought I just hook up the Aesthetix it was that different so you are kidding your self thinking that driving an amp with a DAC is the best sound from your amp the Aestheix is a much much better amp but all amps need to be drive with a preamp
my next up grade will be an amp and preamp  

Good Listening 
@karurravi I don't have a lot of experience with Dynaudio but I have been to the Cary Audio facility since it's local and they used large Dynaudio towers to demo which was outstanding.  They were using the SLP-05 preamp, which I have owned and was absolutely smitten with.  They also used some Cary CAD-805 mono's driving them so obviously it was a great sounding system so there must be some synergy there for them to demo them together.

Personally I use an Ayre QB-9 DAC with a Mark Levinson 326S preamp but my speakers are Aerials and my amps are Parasound JC1's.  I've never heard this combo with Dynaudio, however I can highly recommend both.

I used the Cary SLP-05 with a pair of Class-D amps like your Bel Canto's with great results.  I was using some NuForce reference mono's.  If the SLP-05 had more remote functions I would still probably own it.  It's a VERY special preamp IMO.  Good luck with the search!!!!
I still do and always will use a pre amp...  I have a great DAC with one of the best digital volume controls out there but it simply can not drive my amps as well as my preamp.   Not even close.