Upgrading recommendations

I'm fairly new to the hifi world...I'm trying to get the most out of my set up.

I currently have the following:

Roksan Radius 5 w/Nima Tonearm
Xerxes Phonocable
Transfiguration Axia cartridge
Cambridge Azur 640p phono preamp
Rotel RA-1070 integrated
Monitor Rx6
Chord Silverscreen speaker cables

I'm thinking the obvious would be a new phono preamp.

Any suggestions would be appreciated...especially specific products that would mesh well with the various pieces.

Thanks!