which tubes for which genre ?

Matter of fact: A pair of VTL 300 Monoblocks would be a perfect match for your speakers(if you have the room). Whatever load they are wired for will receive their full rated output. Just be certain they are internally connected for a 4 ohm speaker(easy). WON'T break the bank/WILL rock the house! Very fast slew rate for a tube amp(more detail/accuracy, better imaging, great soundstage) and excellent bottom end.

I have to agree that SET amps will not satisfy you playing rock music. There are some with higher power outputs that MAY work with an 86db speaker, but- most tube amps output less into 4 ohms than 8(the audience is a nominal 4 ohm load). You could get away with 40-50 push/pull tube watts, if you're not into rocking the house(like a pair of modded Dynaco ST-70's switched to mono). There are some good hybrid amps(tube driver/MOSFET output) available on the used market that would give you the option of trying different tubes, but would still have plenty of solid bass and over 100 watts per channel. An excellent example with 250wpc: (http://www.audiogon.com/cgi-bin/cls.pl?ampstube&1230558327&/Audio-By-Van-Alstine-Fet-Valve-Ultra-550)