I have used Brainspawn's Forte for many years now, and find it to be an excellent VST host for live performance.
They have a demo you can download and try, although it doesn't let you save presets. It is quite powerful, however, and worked flawlessly for me. It is incredibly good at managing CPU, in how it deals with swapping out synths that are not used on a given preset- which means you can build pretty large racks of loaded instruments and survive the CPU load that would otherwise bog you down.
Please note that the current 64-bit release does not let you load 32-bit instruments. I have both the 32 and 64 bit versions installed, and I can always build a rack for tunes that require any of my older 32-bit synths. (not many of those left in my inventory).
Bob Bone