1K speaker advice?

I will Ditto the B&W 600 series or the CDM-1.

click on "monitor demo's" and check them out. I'm not sure he hs any left at $795 at Synersound. Better than Reynaud Twins. They origally sold for $1,695

Listen to the B&W CDM-1NT. You should be able to find a new pair in your price range. Don't just take our advice, go listen and make your own decision. Good Luck!

I'm not familiar with the C2, but an excellent used Thiel at that price point would be the CS1.5. This is a fine sounding floorstanding 2 way design. It is excellent with vocals and has wonderful timbre. I don't know what NAD model you have - if it's too bright it will not partner well with the Thiels. If you don't have enough current, you will lose bass extension. Thiels are all about detail. You haven't described your front end, but a pair of Thiels will ruthlessly expose every upstream shortcoming. They could cause an unwanted upgrade chain reaction in the wrong system. But, if you take the effort to properly configure a system for them, Thiels will thrill.

for under 1k, you must give the acoustic energy aegis 3 a listen. new at $700, they are based on the award winning aegis 1's, but are 3 way floor standers that have an added woofer. while all music enjoyment is subjective, i've got to say that these are probably the best speakers you'll find for under $1400. they are very warm, laid back speakers that fit perfectly with vocals, acoustic, and blues - their strong point is the aluminum midrange (super detailed). would be a good match with NAD amplification. i urge you to give them a listen. for budget speakers, they can't be beaten. MUCH tighter / cleaner / more detailed than the B&W 600 series. very musical speaker. sounds like its what you're looking for.