Mellowmuse IR1A...it isn't by any spec high quality as it uses lower bitrate samples than you might prefer, but it sounds great. I always felt like I could blend the right sound I was looking for. I don't know why it seemed to be pretty cpu heavy though, but I'd demo it. I liked that you could take IRs that you liked something about and say, hi pass them if they were a bit too thick, low pass them if they were too fizzly. Now you have near perfect IRs but I think you could still turn them into something unique that nobody would recognize off the bat. I think sometimes what I used to do it blend in the original signal a little (it would be really fizzy), then low pass that. It still did not curve it off too much & sounded pretty realistic. I started using Cakewalk more and it didn't work as well, sometimes crashed but the RTAS ver in Pro Tools worked fine. I'm thinking about trying it again, but I had to uninstall it so I could open a Cakewalk project that was working fine at first & really pissed me off. Something about it though...even if you were doing a bar dive, or let a chord ring out for a while, the sound wouldn't deteriorate or sound the same like a lot of IRs. It's definitely one to try. Just copy your lowest bit rate samples to the directory it uses for cabinets. They might have improved it since I used it, but it seems to still sound like you are working with high quality IRs anyway...
Mellowmuse IR1A (Just kind of through together a one track of rhythm & lead/some cleans using the MM verbs I think but I was in PT). I just blended in stock impulses with cabinets on I think, so probably not the best example but everything else was noodling around or something.