Preamp recommendation pre amp

I am looking to buy a preamp and would need some suggestion.

Currently my system is:

B&W Nautilus 802
Mcintosh 352 (Solid State)
CD/Pre Mark Levinson 39
Speaker cables MIT Oracle V3 (RCA)
IC MIT V3.1 balanced
No special power cords, I am not sure how the power line is but can say the wiring is rather old.

Positives: sound stage, details, layering, liquid mids and good bass.

Negatives: Highs are a bit grainy/edgy and a tad lean, mids sometimes tends to be a bit lean too.

I was thinking of trying the following Preamps:
ML 380s
CJ 16LS MKII

Would appreciate comments on these preamps and also other preamps that you all think would be a good match for my system.

How useful will be a good power cord/conditioner in my setup?

Thanks