The other Native Instruments plugin i bought in the half price sale was Guitar Rig. I used it before and it really impressed with its sound and amp modelling.
I've hardly used it aside from a quick flick through the presets, but I wanted to try out the audio feature of this site so recorded a very quick line with the first effect i liked, and added a rock style break, and an auto filter and exported. I recorded this before xmas, in one take, playing on single strings on a pretty cheap electric guitar, with an ozone over the top on export. Not an idea im going to run with so just for the purposes of trying, but really impressed with the sound & theres so much depth to it i think its going to lend plenty of potential for guitar and non guitar stuff in the future.