On Simon's latest album he used an old 50w Plexi that used to belong to Eric Johnson. It's now owned by Paul Reed Smith.
I'm surpised you thought the Yngwie sounded awful, as that's basically just a non-MV four hole Marshall in tone, which is what you say you want? :?
The XTC weighs a ton, so if the H&K is out then so's the Bogner. But if you're set on an XTC, you'll want one of the more open sounding versions which are the original 100B, the Classic or the 20th Anniversary. If you're after a used one, the Anniversary is the most likely to crop up. I've never seen another Classic for sale since I got mine, and I've never seen a 100B here in the UK. They are more hot-rodded late 70s Master Volume than Plexi though.
If I was you I'd get a Marshall 1987 model 50w plexi reissue and an attenuator for gigs, and I'd use it with a Crunch Box/Guv'nor pedal at home for practice.