I do not know what support/rack you have your system components on, and this could certainly have an effect on the highs and mids. Assuming that that is ok, or at least not significantly contributing to the sonic problems you describe, some past experience suggests that at least some of the mid-range muddle may be due to the IC. However, I would not accuse Monster ICs of grainy or metallic highs (unless suffering from corrosion / oxidation).
I would not immediately suspect the NAD CD player of the grain and/or metallic reproduction. To improve the midrange I would ensure the equipment and speakers are well setup, and try a different IC from the CD player to amp. You do not have to spend tons of money to exeriment: order an inexpensive pair from Signal or Audio Art or something. This would allow you to determine the effect on the sound, and you can always use it in a less critical area if you decide to get better ICs later.
For speaker wire, I would recommend Analysis Plus Oval 12. It is a good all around cable, is affordable, lacks any sins of commission, and would seem a good match to the rest of your system.
I would not immediately suspect the NAD CD player of the grain and/or metallic reproduction. To improve the midrange I would ensure the equipment and speakers are well setup, and try a different IC from the CD player to amp. You do not have to spend tons of money to exeriment: order an inexpensive pair from Signal or Audio Art or something. This would allow you to determine the effect on the sound, and you can always use it in a less critical area if you decide to get better ICs later.
For speaker wire, I would recommend Analysis Plus Oval 12. It is a good all around cable, is affordable, lacks any sins of commission, and would seem a good match to the rest of your system.