Don - I would order the modular phono stage for the LS100 without hesitation. Everything I have heard and read is that it is at the level of a $3k standalone phono-pre. I highly doubt you will find anything that sounds as good at anywhere near the $800 upgrade cost.
I look forward to hearing how you like the LS100/KWA100 pairing - I suspect it will be a substantial upgrade over your C220! 
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McIntosh MC501s, XRT29s, XR27, WS350s
ModWright LS 300 Preamplifier
Denon AVR-A100 HT Receiver
JL Audio F113 subs with CR-1 Crossover
Schiit Audio Yggdrasil DAC (Analog 2 + Unison USB)
Sonore Ultrarendu with Uptone Audio LPS-1.2
Uptone Audio EtherREGEN network switch with LPS-1.2
Oppo UDP-205 with ModWright Signature Truth Tube Modifications
Clearaudio Performance SE TT with Hana ML MC cartridge
ModWright PH 9.0x Phono Stage
ASC & RealTraps Panels; APS PurePower 2000; Daedalus Audio DiDs
LAT International, Shunyata, Wireworld, WyWires Cables
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