The best timbre match would be with the LCR. Don't even bother with the CC6 (it's a waste of time and money). The N-HTM2 is a fantastic center channel and should be enough for your 640i's.
The matching center for the 640i is the DM600IFS. I used to own one, and it matched well with the 610i and 600i I had at the time. You can find them on eBay alot for between $120 and $150. The data sheet/manual for the 600IFS can be downloaded on Adobe format at: http://www.bwspeakers.com/downloadFile/speakerModel/DONE_-product_info_DM600i_IFS.pdf
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