There are so many brands that give you clean and Solid, most of them with their own flavor or 'signature' mixed in. SWR is a good one, and you may find what you seek in a Peavey, markbass (though more expensive), Kustom, Gallien Krueger, Hartke, Ashdown.
They are all fine, the key is to try before you buy. Compare as many as you can!
Also, have fun searching, the search alone taught me a lot.