I had a Tweaker 15 and it was a decent amp. I played it either thru my Epi cab like Tig's or my Epi So. Cal. four by twelve. It malfunctioned on me, blowing the fuze and tube. The replacement tube got so hot that it burnt the paint off of it. Instead of getting it fixed under the warranty I sent it back to the company and was very lucky to get my purchase price applied toward a Peavey 6505+ combo that is also a good amp for high gain and ultra high gain, super loud stuff.
This is probably too heavy for you but I'll describe it anyway. The SCX2 is cool but this isn't one of those. What I have found is that I really like this new amp I bought about six months ago, brand new. It is a Marshall JMD-1, two twelve combo. It has two different Celestion speakers in it. Marshall is only making them on special orders now and has discontinued normal distribution of them. The big places are still blowing them out. You might be able to get one for the price of a Tweaker and a cabinet. They were around 1500 before the discounted blow out prices.
It is a hundred watt amp with four EL 34's in the power section. The preamps are digital and it comes with an awesome foot pedal that connects with a regular guitar cable but is totally powerful and awesome. It models probably over sixteen Marshall amps only - just Marshall amp models. It has some excellent effects including a great tap delay and a good reverb, plus others.
One particular thing that you can do with it that I like is turn it down to whisper bedroom level and it still has the tones, overdrive, etc. It has a master volume. This makes it nice. Each amp model has about five channels that you can use as preset or modify and save, plus manual and the straight up model. So it has a lot of channels to choose from. The presets work like channels and are foot switchable. It is an awesome amp in the opinion of many owners and a bargain at the blow out prices. Here is a link to a place selling them that I have no financial or friendly association with:
http://www.wwbw.com/Marshall-JMD1-S...Digital-Guitar-Combo-Amp-423471-i2603472.wwbw
Sweetwater has the head for about the same price:
http://www.sweetwater.com/store/detail/JMD100H
This is a very decent amp that you can get a lot of great tone out of and it is very versitile, covering the history of Marshall amps sort of, and tweakable. It is not at all like a Tweaker 15, but I thought you might not be aware of it and could possibly be interested in something like this.
This would probably be a stationary amp for you but would be able to cover a lot of territory and also be able to whisper or wail.