I've been looking into a second amp for a while, something to compliment my Mark IV. Today I was offered a really good deal on a Stiletto which I'm strongly considering, but I'm looking for opinions on other amps as a second head. I'd be running them through my Mesa standard 4x12, and I'm looking for a thick, fat lead tone (I know my IV does exactly that, and extremely well, but perhaps a different flavour?) and a big rhythm tone. Cleans would be real nice, but I do quite like the Mark IV cleans so... I've considered the Shiva and the XTC 101B too, so hit me with any suggestions.