i sooooo want a modded jcm 800....it's the perfect thrash tone. period!
the 2210 sounds better for leads, but there's something about the 2203 that just screams METAL rhythm.
i guess with the added fx loop on the 2203 re issue you could even get a pretty versatile rig out of it. just get a boss gt8 or similar and run the 4 cable method.
as for more gain, the 2203KK has shittons of gain on tap. i just wonder why the fuck the beast option isn't footswitchable. makes zero sense to me.