I have exactly that rig.
1. It will require internal mods to get past "passable," whereas a small modeler such as the MicroCube will have a number of good sounds right out of the box.
2. The modded Crate sounds awesome... with the volume dimed, which I measured at >105dB @ 1m. Turning it down, it sounds OK, but it's really gutshot under about 8. Not an inside amp.