software

I'm playing through a Marshall JTM60 which is great but for one factor; bottom end. For ages I've thought about getting a 2x12 extension cab until I thought why not get another amp? So my first question is this.

Should I get a 2x12 cab or a 2x12 combo?

Potentially that leads to another question; which amp? I want something with crystal clean sounds. Not bothered about distortion as my Marshall sounds awesome plus I'm running three distortion O/D boxes that I'm happy with. I'd like to know what it would sound like with the second amp on clean and my Marshall dirty as well. I bet that would be cool. Isn't that what the Voodoo Lab Sparkle Drive does?

I don't think I'd need another valve amp either. Maybe a valve pre-amp section. So my second question is this;

What cheapish ($500) solid state basic amp with a 2x12 speaker configuration with awesome clean sounds should I get? When I say basic I mean no DFX or that other stuff that comes with the higher end solid state stuff.

Thanks for reading,
Ben

Clean solid state = Roland JC120

I've heard about those Roland JC120's. Can't find one in the U.K. though. Any other thoughts. Cheap as possible really. I'm at school so, no dough

Behringer GX212. Don't know about the new GMX.