Wilson W/P6 with Krell 350mcx, turn into home thea

I have Wilson Audio Watt/Puppy 6s, Krell 350mcx mono blocks and Krell KRC 3 preamp. I would like to turn this into SACD - DVDA surround multi-channel. I am thinking about a used 3 channel Krell KAV 3250. what might be recomended for a head unit and preamp/ processer? Can I still use my KRC 3 two channel preamp and buy a 3 channel preamp? Any other recomendations would be helpful!
Thank you!
I would suggest selling the KRC 3 and picking up a Krell HTS 7.1 processor. The KAV 3250 would work well.
Krell has a trade up/in for Hts 7.1 for a limited time..Check with an area dealer..Great sounding piece..I do not know of all the particulars..Tom