You should at the very least before you jump into VEPro, watch the first video to see if VEPro fits into your style of working or if you are willing to adapt to it. VEPro is essentially an external MIDI/VST mixer where you route all (or most) of your VSTs (and possibly effects) outside of your DAW and them route them back in. In the process it alleviates the DAW of doing the heavy lifting in terms of computation.I'm going to look into Vienna Ensemble Pro 6. But I still might "upgrade" the audio interface.
Here is another one...
There are more than a few threads on VIC about this topic that you may wish to read.