Egnator Tweaker 15 has very nice cleans and takes pedals well.
Another vote for a Tweaker. It has an amazing amount of tonal versatility that no other amp in it's price range (under $400) has. The cleans are beautiful and you get a selection of them. Fender type clean, Vox type cleans, and Marshall type cleans. It gain do moderate to high gain OD as well.
It's a 15w amp with plenty of volume and clean headroom powered by two 6v6s and 3 12ax7s but the other nice thing is that it's cathode biased and can take any octal tube made. So you can also run EL34s, 6L6s, 5881s and any other power tube that will fit the chassis.
It has a three band tone stack, master volume and gain controls and an effects loop. The other features such as vintage vs modern voicing, bright vs normal, deep vs tight, and hot vs normal all make noticeable changes in the amps tonal character. It can be set to run 4ohm, 8 ohm, and 16 ohm, speaker configurations as well so there's no cabinet you can't run it with.
I can only suggest what I play and I just bought one several weeks ago and still haven't worked my way through all of it yet. This is another amp I've found that's a keeper I'll never part with.
http://www.sweetwater.com/store/detail/Tweaker