I also like to have different types of grand piano. At the moment I am quite happy with the choice of Yamaha CFIII piano sample from CP1 on my MoXF flash, S700 piano on my MoXF flash, Roland SRX 02 (which is a very warm German piano, probably an old Bösendorfer), Roland SRX 11 (a Steinway) and Integra SN-A piano (probably somehow derived from SRX 11, I suspect). And there are several others available as Motif/MoXF flash libraries.
I thought about a Nord, especially an Electro 5, but I rather like to have only one main instrument, and all the Nords lack workstation features.