screamingdaisy said:As soon as you say classic rock I think Greenback (G12M-25). I use a pair of them with my Mark V and they're f*cking amazing. I use a pair of Widebody 1x12s but I'd recommend a Recto 2x12 so that you get thump of a closed back cab. You'll be limited to using your amp on 10/45w modes since a pair of Greenbacks are only rated for 50w.
If you want to stick with a 1x12 then I'd recommend the Royal Atlantic 27" 1x12 with a V30 in it (which is rated for 60w and will also limit you to 10/45w modes). It's a great sounding 1x12 with a fuller response and less boxy sound than the 23" Widebody cabs. It's a rear ported cab, so it still gets some thump, yet it also spreads the sound around the room a bit.
If you want to be able to use 90w mode through a small cab you'll need an MC-90 loaded 1x12 or a 2x12 loaded with V30s (there's other options, but I'm only writing about what I have personal experience with). The MC-90 is a good speaker but I don't particularly like them. A Mesa 2x12 loaded with V30s is getting into modern hard rock/metal territory.
Mesa's V30 loaded cabs are more modern sounding... thicker lower mids, smoother top end, more punch/less crunch.
Greenbacks are it bit more middle mids, more hair on the top end, more crunch, and they scream when you solo through them.
This thread and my search are specially gears towards using a (mini)Mark V:25. So I won't have a problem with the wattage thing.
So greenbacks are great for classic rock overdrive stuff, that's great and that helps. But won't the cleans suffer then?