Modulus 3A help needed and moving coil question

I just bought a Modulus 3A and am buying a Conrad Johnson MV-75 A1. I am concerned about impedance matching and wonder do any of you know if those two units are a good match for each other?
I recently bought a nice turntable as well and after hearing good things about the Denon cartridges, picked one up.My Modulus doesnt have the extra phono stage for low output moving coil cartridges and I dont feel like spending the extra $600 for it. My problem is, I did not do my homework. I originally picked a Denon DL110 which would have worked fine with my phono stage being that its medium output but then I bought a DL103 at the last minute because so many people praised it. Well now I find its low output means I need a separate transformer and I'm not crazy about that. Would I get better sound for my money out of using the slightly cheaper DL110 cartridge instead of using the 103 with some sort of transformer/ amplifier? I dont want to shell out hundreds more for that part if I can help it( at least not for that Curl unit that A.I. sells) Of course I'd still have to sell off the 103 now if I drop down to the 110.

Another question is, which input to run the cd through? I heard some people saying to use the tape in. Why?