Saw that Mick - had an email from them with an introductory offer - too pricey for a plugin IMHO.
Cubase has got the Amp Rack built into it and that works really well. I can't see the need to lay out more.
I expect that you have the Fender version of Amplitube 3, and that has enough in it for me. I can add any pre and/or post effects using the built in stuff in Cubase and various freebies.