TommyC,
as I already said to you, be prepared for a really audible improvement. Probably more marked than changing your player with a DP-720 or adding a PS-1220: fully agree with Suzuki San
It is already nice with a simple voicing in most situations, but to get the most out of DG-58, be also prepared to spend some time tweaking the EQ portion. In my case, with some speakers (less with others) a carefully and over time adjusted EQ gave another big step up in the performance of the system.