I remember the day when you could snag these rg100ht and rg100es heads for $200 - $400 all day long on ebay. They were excellent deals as they are great sounding solid state amps. The whole Dimebag tone thing just blew up and prices have skyrocketed since.
I had about half a dozen 1980's RG's over the years and ended up selling them all due to GAS for other amps and now I seriously regret it. I should have kept at least one. My fav was a 1984 rg100es head. It had serious mojo to it... but was very picky about what cab you used with it. It always sounded best when you ran it with two 4x12's at 4ohms. Really punchy, mean tone. Had a bouncy feel to it, especially with palm mutes. Always boosted of course.