Yeah, you are right about VHT being sort of under the radar. I equate that to music though. You usually have to dig to find the best music, the same goes for great guitar gear. Musiciansfriend, American Musical, etc will just sell your common amp brands. You usually have to search around for smaller boutique amp shops to find the higher end brands. Marshalls and the big name amps are great, I LOVE Marshalls, but sometimes you just want something different. Lol!
So you want a new amp? What is your budget? Your budget will probably be the most determining factor in what you get...
The Peavey 5150 cannot be beat for the price it goes for used. They will go for $500-$600 on eBay, and there is usually many of them on there. They don't have the best of clean, due to the shared EQ between the channels and the fact that the amp was never designed with the clean channel as a primary goal. You won't be getting any Opeth type cleans out them, that's for sure. At 100 watts that thing will enable you to play stadiums through a 412 without being mic'ed. I don't know if you've ever played a 100 watt tube head through a 412, but it is seriously the loudest sound I have ever experienced. Every guitarist should experience that feeling of power sometime...
There are so many differernt amps out there for you...you sort of need to try to narrow it down for me. What sort of mids do you like, how about bass? Can you name specific bands that you want to nail?
1) Marshall JCM800 w/boost
2) Mesa Mark series amp (II, IIC+, III, IV)
3) Mesa Rectos
4) VHT 50/CL, 100/CL, CLX, or UL
5) Engl Powerball, Blackmore, Savage
6) Bogner Uberschall
7) Framus Cobra or Dragon
8) Voodoo Witchdoctor or Hex
9) Diezel VH4, Herbert
10) Rivera KH heads
11) Peavey 5150, 5150II, or XXX
12) Etc, etc, etc...
Those are some very common modern high gainers that could do a skull crushing metal tone with no sweat. They vary in price hugely though, from about $500 (for a used 5150) to $4100 (for a Diezel head). Just a lil' more info and I could help you out better...