Mixing a Stereo pre-amp with HT Pre-amp processor


I currently have a McIntosh MX135 Pre/Pro and in the recent visit to the RMAF. I had a mfg rep tell me that if I bought a stereo pre-amp with Passive Pass Thru that I could place it between the MX135 and run the 2 front channels thru the stereo pre-amp. And have my stereo source components run thru the stereo pre-amp and totally bypass the MX135. He said that I would make a big gain in sound quality, I called McIntosh and they told me that I could gain as well, of course they recommended a couple of McIntosh pre-amps that had this capability. My question: Has anyone done this, was it worth it? What PreAmp would you recommend? I was looking at the Ayre K5XE and possibly one of the McIntoshs. Just curious if this would be worth it.
128x128theo
One good thing about having a non pass thru tube pre is that you are getting the tube benefit at all times, some with pass thru maintain the tube pre use, some dont and just pass the pro's signal. but So you use a non pass thru unit the tubes always sweeten the signal.....even for cable or satelite music channels and such.
Can you guys suggest a manufacturer which has the pass-thru option & is also in the sub $1,000 area?
Are you looking for used or new? The TAD 150 Signature is worth considering, and can be found used for <$1000. But I think they are only available used.

TAD (Tube Audio Design) also sells a sub ($289) but I'm not familiar with it. I like Rel Subs - and you can find Rel Storm III for ~$1000 used, and Rel Strata III can be found used for ~$750 used I think . New Rel subs are somewhat more than $1000, though there may be an entry model below $1000.
New or used doesn't matter. Probably better off with used since my budget is so limited. Presently I am using a 15 year old Denon AVR-3000 receiver.

Also, i mean under/sub $1000 for the price of the pre-amp. I didn't mean a subwoofer :) thanks though, going to try to make one myself actually.

thanks again
Also, i mean under/sub $1000 for the price of the pre-amp. I didn't mean a subwoofer :) thanks though, going to try to make one myself actually.
of course, had I read your post more carefully, it would have been clear to me. Now and then I simply start talking before my brain is properly warmed up ;-)