if i had to play a solid state amp, i'd probably go for the MG's. i used to have an old valvestate, and it was pretty good for the money. i bought a half stack used for $700 and sold it 4 or 5 years later for $650. 5 years of use of a marshall halfstack for $50!
if it's solid state, it will be tough and solid and use won't really affect it, so you can definetely go used without worrying about it.
anyway, now i play a JCM2000 DSL100 loaded with super-secret tube combinations and a custom 4x12 loaded with Celestion G12H-30's (why doesn't Marshall use these wonderful speakers anymore?).