I have owned 2 Splawn Quick Rods, the EL34 XTC 20th, a 101b, 20th Shiva and now have a Helios 100 and Splawn Super Comp Mini.
To your original question on the Helios, 101b and Eclipse...the Helios is what has stayed for me and I am strongly considering an Eclipse now myself. The XTC amps are really great, but in the end they lacked the aggressive bite I want. Just could never get the XTC amps to sound as mean as I wanted. I have been ok with the versatility trade off as I never play the clean parts in the few spots we have some in our set list so I ride one channel and use the volume to get lower gain where needed. That said I found myself drawn to the idea of the same great tones with a dedicated clean and 2 gain channels I can dial in how I want.
I moved away from Splawn QRs after a while because they just kind of started to irritate me. Hard to explain. Sometimes sounded great, but dialing the high end is a pain and the rear with that Treble blend pot. I ran Treble on 0 to keep the mid bite and thickness of the amp in tact and tried to use the Presence to balance out the high end, but it didn't always work great. Harder to get fat sounding single notes above the 12th fret. They are pretty mean and aggressive, which is a lot of fun. When I could get that amp cooking at some volume it was awesome. Definitely more of a dry JCM800 kind of gain going on.
The Helios on the other hand is much easier to EQ, is super pissed and raw, thick as hell and stays nice and fat on single notes. It is just a bit more alive and complex at all volume levels where the Splawn wants to rip heads off to sound right. More juicy Hot rodded Plexi, which I have found I prefer to the Hot rodded JCM800 tones.
I recently got the Super Comp Mini as a small head to carry in and out to practice and as a backup head when I gig. It sounds pretty cool, but I really haven't put it through its paces yet to totally comment on the tone and really dialing it in.
You can't go wrong with any of the amps mentioned in this thread and you are right....that QR at that price is hard to pass up and you are getting a killer high gain amp!