OM 5E is pretty bottom of the line for them. It's not terrible, but you can do better for sure. My Dual CS 460 came with an OM 10 and I put an OM 20 elliptical diamond stylus on it. I think you can easily upgrade the OM 5E as well with just a better stylus without replacing the whole cartridge.
I have a Cambridge Audio 551P pre-amp. I think it performs well for being a less expensive pre-amp.