Never cared much for Soldano amps. They always sounded hollow to me. One of my favorite heads was the JCM800 50w. Played that for years before I went to a fully racked rig.
Friend of mine is an investor at a boutique amp company called http://www.65amps.com/ They have some really nice stuff.
For right out of the box tone/gain I think you'd have a hard time finding something to beat some of the Mesa Boogie or http://www.hughes-and-kettner.com/ rigs. See a lot of people using Line6 these days but I can't offer an opinion on those as I haven't played with one.
Re the bass stuff... GK and Trace Elliot have dominated that market for decades.
I love H@K.. I have their Cream Machine micro-amp.. Awesome little unit.. Can be used as a pre-amp or a 1 watt...
BTW, I think lots of amp enthusiasts would disagree about the "hollowness" you speak of.. Maybe you heard it through a junky cab or something..
My Soldanos are anything but hollow, I assure you....
Not really a fan of Line 6.. Their insides are a mess.. I owned a Spider Valve for a few weeks.. The modeling part was ok, but going through the tube power amp sounded horrible..
And as far as the JCM800

Will always be an awesome amp....