McIntosh MX132 - MX134 How relevent are they?

I have owned both and from memory the b1ggest differnces that come to mind is as follows: (preface listed as advantages of 134 over 132)
-Better processing chip the latest at the time expecially on pro logic
-more extensive user interface for adjustability
-134 is built more as two in one, the stereo side is basically a C45(or C46 memory fades) so the two channel performance is more in line as a seperate pre amp from the processor side.
-better power supply
One other point is the 134 is the same basic platform for the current 136, I had traded the 134 in on a 135 but recently traded to Anthem D2v. My experience with the anthem is that mcintosh is much better in 2 channel. My point is if 2 channel is important look at the 135. Hope this helps the Sunfire is a great peice but in the long run I think the McIntosh will deliver better performance and offer greater durability. All MHO of course taken from ownership of the 2 you asked about.

MX135 betters both of them and can be had reasonable because all the Mac Cats with means $$$ are upgrading to the MX150

I've owned an MX 134 for 4 or 5 years now. I love it and paid $3,000 for it. I'm running an older MC 126 amp with it, bridged to 3 channel mode, for 275w/ch to the mains and center. My speakers are 10 year old Def Tech BP 2000tl's. This system is phenomenal and I put it together for about $6k. In 2 channel stereo it lacks nothing, which is what I primarily use it for. With pre-amps there is always the fear of the next new processor format coming out (pro logic, dts, trueHD, dolby digital) and obsoleting the previous standard, but I have never had upgraditis on this system. If you can find a mx132 or 134 for between $1,000 to $2,000 in good condition, I would buy it in a heartbeat. I haven't heard the sunfire so I can't say it will stomp it, but it should make you very happy.