The limited version TH3 is sufficient for me too. I own a couple nice tube amps but I rarely use them anymore. The TH3 sounds great.
However, a little trick I use a lot is spliting the guitar signal with a Y pedal. One side goes to the interface for the TH3 and the other side goes to a small guitar amp with distortion set high. I place the amp close to the guitar and it acts as a string exciter for sustain &/or feedback. It makes it sound & feel just like a real mic'd amp. You could mic up the amp too if u wanted but I never do. It's simply there as string exciter. The only thing recording is the TH3.
I'm sure many of u already know this trick but I thought Id mention it for anyone who didn't. It def helps make up for the one weak spot of recording in the box, which is lack of natural amp response.
For clean parts and rhythms I usually dont bother with it but for most solos I use this little amp setup. Cheers!