The Mark V's clean channel is astoundingly good though.
a lot of you guys are saying Deluxe Reverb? That is NOT a clean amp especially at higher volumes. I own a 67 or 68 SF Deluxe reverb & once the volume gets over 4 they start to over saturate the tubes. Now don't get me wrong I love my DR BUT due to the lack of headroom, if you play with a loud band it wont stay clean too long. For me it would be a Blackface twin or a Dual Showman Reverb. The DSR is essentially a Twin in a head. AND you can hook it up to a variety of speaker cabs to even color it differently. I think if you went with some 15" speakers iy would stay clean quite nicely....
Those are great amps, I wish I hadn't sold the one I had when I stopped playing for a few years. I'll probably get ripped for this but.... I have a B52-AT212 that sounds absolutely amazing on the clean channel, especially when plugged into a decent speaker cabinet. The gain channels aren't very good, but the clean sound absolutely kills. It's the only reason I still have the amp, there is no way I could replace those clean tones for anywhere close to what I could sell it for. Fortunately, my other amps cover the various distorted tones I use.I use a Fender Blues Deluxe Reissue (40w) and I think its got some beautiful clean tones with loads of headroom. Set the EQ right and you can anything from bright and chimey, crisp and polished, to dark and muddy. I tried out a couple others at the store when I got it but I think it has the best, for me anyways.