Sorry if this has been done before, but after reading through much of this thread (and searching more broadly), I can't find an answer. I'm wondering what the real differences are between the SVT II and the 2 Pro. The first bass amp I ever player through was a 2 Pro and it was awesome - I assumed since it had Pro in the name, it would be better than the SVT II (non pro) - but sounds like you all think differently. I'm interested in perhaps getting one with a Berg NV610. Any thoughts would be appreciated. Thanks!
The differences are both obvious and subtle. The Pro adds a couple more bands on the EQ, tuner out, gain control, etc. These changes were more about modernization of the SVT than anything else.
The less obvious differences are internal. The SVT II (non-Pro) circuit is close to the original SVT circuit, while the SVT Pro was changed to better meet the changing demands of the modern bass player. These changes included a higher-gain input stage and pre-amp circuits, as well as protective devices to allow the amp to run even when a tube fails. The power amp section is the same, except for the protective resistors, which are designed to blow (open) if a tube fails, possibly saving the OT from damage or meltdown. I'm sure there are plenty of references to this if you search the archives.
I own an SVT II (non-Pro), although I hardly ever use it anymore (too heavy). When I do break it out I use it with a 4-ohm 4X10, mainly because I don't have room in my car for anything larger -- except maybe a 6X10. If I owned an SVT Pro I'd be just as happy. They're really not that different, especially if you watch the input gain level. I can't think of a better way to make my bass heard than with an NV610 and an SVT II -- Pro or non-Pro -- provided you can deal with the weight. In fact, that just might be the direction I go next.
BUT...... I have a "new" SVT-II arriving Friday!!! 
Cant wait!!