You have gotten a lot of very good suggestions. I would add looking at amps made by Boyuurange Reisong to the list -- especially the A50 MKIII 300B and the A10 EL34. Both are built like a tank, a ridiculous value (you could buy both and spend less than $1,800), and allow you to "test the waters" of tube amplification without taking out a second mortgage. The big caveat, however, is the low output. These amps will work fine with your Heresy's, and should be OK with the Omega's. I am using Polk Audio Monitor 10's with the A10 EL34 and it sounds excellent. The A10 is only around 6 watts per channel. The Dennis Had gear I mention below could not push the Polk Audio's, but I also have Klipsch Forte II's and Heresy's from the early 1980's which is perfect with the Had gear. The Reisong amps make the Klipsch sound like butter.
I already had a McIntosh MC-225 from 1963 paired with an ARC preamp, and a Dennis Had Inspire 45 "Fire Bottle" paired with a Had LP3.1 Preamp. I wanted a low cost tube integrated for a bedroom system that I was putting together. The Reisong’s were perfect choices for my situation. They have been my only experience with "Chi-Fi", and I have not had a single problem over the 5 years of ownership. Happy shopping!