Wow - that's quite the price upgrade! I am only familiar with the Luxman and Mac in passing, but they seem to be very high quality unit (and nice looking to boot!). I can't say anything about the Parasound combo's reliability but I do know (having had one of their amps in the past) that the sound quality is excellent.
I did, however, have the Yamaha A-S801 and I did not truly realize what a fantastic unit it was until after I was forced to sell it last fall. Going up in their line to, as you mentioned, the A-S1200 will lose some functionality (the DAC) but a possible increase in sound quality (there are plenty here on AH that will argue that point). The 1200 is also much better looking and built to a higher standard. Why are you stopping at the 1200 if you are willing to pay so much more for the others? Accessories 4 Less has some good deals on the A-S3000:
www.accessories4less.com
And Music Direct has a great deal on an A-S2100 in silver: