Phil's bang on there, Matamp build superb quality amps for the money, that sound awesome, have superb customer focus. They are also a really nice bunch of people. Plus they'll build it to your specs, your choice of coverings, and your choice of speaker if you buy a cab, usually all included in the price.
I'd highly recommend a trip over to the factory near Huddersfield, not only will you get to try out some amazing amps, you'll get a brew and a healthy dose of northern humour! ;)
The King Street Major is a great 50w head, with a triode/pentode switch which knocks the power valve operation down by half, and a full/half power switch which further reduces the output to around 15w. Very useful! The 1224 takes this a few steps further by giving you the choice of Class A or Class AB operation, with either 1, 2 or all four valves!