Don't get me wrong, the built-in reverbs of the KPA are very good, but try these:
http://www.valhalladsp.com/valhallavintageverb
http://www.valhalladsp.com/valhallaroom
Two of the best reverb VST plugins in the world. And luckily not that expensive.
If you layer a thin mix on top of your current sound (maybe even on top of the KPA reverbs if you are a reverb junkie like me)... you will be in tonal heaven I guartantee.
And do not forget the direct monitoring tip:
Latency is very important, so if you can you should play with direct monitoring. The problem is that you cannot apply effects in direct monitoring mode. But do not worry, for reverbs there is a cool trick: just add the reverb VST on a separate track 100 mix, and adjust the level of the track for setting the actual mix. You won't notice the small latency with reverbs. And the guitar sound will still come from direct monitoring.