Hi Ron,
If they are all .WAV already you can leave as that. For less bandwidth, you could run the .FLAC converter over them all to save some HDD and bandwidth.
Personally, if you already do EAC I'd stick with that and if you don't need i-Tunes, then stick with just Slimserver. YMMV
Check out Mark's post from a while back on getting the most from it all. It's been linked loads of times since.

Have fun

Rgds,
Nick