Right, gotcha! (And the AC30 models are probably good choices, too.)
Hard to go too far wrong with a basic TubeScreamer-type deal for any kind of overdrive-friendly guitar environment. Amplitube's Overscream stomp model is the "based on" one, there. However, I might also consider some of the more recent stomp models in the file, like the Fulltone OCD model and the T-Rex Møller model (which isn't actually that recent ... but is TubeScreamer-ish, and has some added flexibility of its own).
Something you might not have thought of is a noise gate: The "Slash Gate" from the "Slash" bundle is well worth it, IMO, to most anyone. It's based on the MXR Smart Gate. (Or is this just "Gate" now?)
All that said, IMO, the real secret weapons of Amplitube (and, probably, the real world!) are cabs (and to a lesser extent mics). Being able to swap and mix'n'match between "based on" SM57, MD421, R121, U67, U87, etc. noticeably extends the tonal range from amps and pedals you already have -- and having a pile of different cab (and, thus, speaker) models
vastly extends that tonal range. I've honestly bought cab models without even buying the matching amp sometimes just because ... they can be useful.