My first was a 1977 JMP 2204, which I got for £400 about 15 years ago. I think it's still the best sounding amp I've played through! I got a Vintage Modern 2266C combo around the same time, and it's still amazing too.
My 1st and only Marshall so far is my Origin 20H. Before that I only used Crate amps (outside of my little Fender Mustang 1) since the early 90's. I got rid of my last 2 Crates and got the Origin shortly after.
A 1977 Marshall JMP MKII 50 Watt in Fawn. Man I miss that amp, if not the weight. I broke (at least) three handles over seven years carrying that amp. Always manage to catch it before it met the pavement, however.