I have had just about every guitar under the sun, but I have still had my fair share of amps too.  I still have not found an amp that has the sound I am looking for.  I know that you can't go from records as the amps are recorded loud, always at a level you cant try out in a shop or in a house.

I have just recently bought a Mesa TA-15 off e-bay and that is a great amp, the tones are simply sublime for small gigs but I am starting to do bigger gigs and it won't hold up in the 25 watt setting (not as sweet as the 15 watt).

I love el84's but the struggle to give any sort of bottom end and was considering 6v6 or EL34 or KT66.

Looking for something that does clean - slight breakup that will sound good with an OD/Compresion and Delay before the amp.  Don't want the hassle with a K-lator in the effects loop.  Tastes are Knopfler cleany/sustained lead tone, Mike Campbell Rockout tone to ZZ Top high gain.

Need about 30 loud watts before the insanity would kick in

JTM45 sounds just the ticket -  they are a loud 30W

AFAIK Jeff Beck has been playing a JTM45 for sometime
I saw him a few months ago, and it looked very much as if the whole gig was off the single JTM45 sat on top of a cab. All the tones you mention were there
He had a few pedals too though!

My Ceriatone JTM45 sounds excellent as a saturated cleanish lead tone, with my time based  FX and compressors in front if needed
tbh though, a Bluesmaster 50 would be a much more versatile amp, with good blackface tones, and you don't need to use the FX loop - if you keep the preamp volume down to 2 or 3, good delays etc can go up front

Either would beat anything a normal guitar shop will attempt to sell you