For me the biggest driver for getting a TI over a A/B/C is that TI has per part Delay/Reverb versus the A/B/C global Delay/Reverb. Makes a world of difference imho.
I sold my C to get a TI; the main driver was per part Delay/Reverb, essential for playing live. The VST/Integration was a nice bonus.
Or get a SuperNova II 
FYI
