Genalex Gold Lion EL84

I've no direct experience, but I've read good things about them and will probably be trying them in my Music Reference RM10 MK II.

You mean EL 34's don't you? In which case (if you want the ultimate in sonics) I would recommend the NOS Genalex (but VERY expensive!)

JJ currently makes a KT77 that a lot of people seem to like, and they're not too expensive:

http://thetubestore.com/teslakt77.html

Mullard Russian EL34 for Dynaco ST70 and Genalex Gold Lion EL84 for Eico HF81

Well, you only mentioned the Dynaco in your OP, so I just assumed you were talking abour EL 34's ;--)

Frankly, all those "reissues" from New Sensor in Russia are not notable for great sound. They do the job is all you can say about them. If you want really good EL84's, you should need vintage NOS. Try and get some NOS Mullard Blackckburn's (with the one sooty hole in the plate ;--) or the NOS RCA blackplates. Otherwise, the JJ's are considered the best of the current crop, or the Mullard reissues, I suppose.