I just recently switched to Avid Eleven (Mk2). It's the most natural sounding and feels most real to me when playing. Sits far better in a mix than everything else I've tried (AT3, S-Gear, Guitar Rig, all kind of POD's and Podfarm, Revalver, ...).
I found some free Ampeg VL-1002, SVT-810e, Eden 4x10xlt, and Orange Custom 4x12 a few years ago on some forum I frequented. They're pretty decent..Bit off-topic, but does anybody know of any really good, free bass cab impulses? Nolly uses a redwirez ampeg 8X10 with a d112 in his CreativeLive video and it has a great thump with clean high end on it and I realized all my bass impulses sound like dogshit by comparison.
For high gain, I like the Rectifier and Bogner Red (Ecstasy) models. The Recto likes the Green JRC Overdrive in front.eleven sounds great to me for low gain stuff, but I've got nothing less than atrocious sounding results with any of the higher gain stuff. What amps are you favoring? Using the stock cabs or separate impulses??