Welcome back, snmhanson.
There is no synergy between NAD pre and amp. I have the same amp. I used to have a NAD pre. I prefer my Onkyo receiver as the pre at this point.
The biggest synergy you must address, is speaker positioning in accordance with the room. One smart fellow who has taught as much about acoustics as anyone else would actually say the listener positioning is even more important. Anyhow, the above combined will outweight pre-amp synergy by the order of thousands.
I also believe the Integras are the best value. Analog performance could be one of its only detractions, according to some, but if everything is hooked up digitally, then you are golden.
The NAD has two interesting features. The first is that is has a modular design. However, they haven't taken advantage of that yet, AFAIK, and if they did, I fear how much the upgrade would cost. Software seems to be cheaper than hardware.
What really drives me nuts about the NAD is that it lacks onboard decoders for the advanced codecs. This is unforgivable, at least at this point in time. Maybe they thought that the only bluray player in existence would be the PS3. They should've addressed this by now.
The second is the addition of more Audyssey curves, namely the one designed by Paul Barton of PSB fame. This unit, as well as the Integras, not only sport XT, but have Pro capability (more money, and need to hire a pro with a computer).
I have no idea what the emo will sport in terms of room correction.
The Outlaw will have Trinnov, which is France's direct competitor to Audyssey. A different, and very expensive, high-end room correction could be found with Meridian.
Some folks are very interested that you can turn off correction above 300hz (iirc) with the Trinnov. This is not possible with consumer Audyssey versions, and I don't know about Pro.
Nice choice of amp. Nice choice of speakers. You're doing very well!
**yes, you noted I use an Onkyo receiver as pre/pro. It was refurbed in fact. I saved a grand by not getting the Integra. I didn't feel the need for Pro Aud, balanced XLRs (note that your amp doesn't have them), Reon HQV, dual HDMI outputs. I WANTED the Integra, but my money went much further with the large purchase of room treatments. Nothing outdates faster than the pre/pro anyways, IMO.
Hope this helps.