Your Einstein has a killer effects loop. Just get the TC Nova reverb or the TC Nova System (I have the system). Great sounding reverb and a bunch of other effects with the system.
I don't use the overdrive in the Nova System. I use the amp with a Klon to boost it. That said they built it with that question in mind and it has a separate routing if you want to use the distortion (in front) of the amp. Really easy to use and they system really sounds great to my ears.