Since you mentioned Hiwatt I would highly recommend that if you live in the UK, or a Reeves or Hi-Tone if you live in the US.
I've had all three side by side, Hiwatt Custom 100, Reeves Custom 100, and Hi-Tone Custom 100. I kept the Hiwatt and Reeves, but the Hi-Tone was a great amp.
If you want built in spring Reverb then maybe a Reeves Space Cowboy.
All of them are built on the basic Hiwatt DR103 100 watt platform. The Custom 100's are 4 input, and I think the Space Cowboy is a 2 input front end.
Fwiw I'll take my Hiwatt and Reeves with the right pedal(s) over every high gain amp I ever played through for heavy music, and the pushed cleans and classic crunch tones are pure rock heaven.