FranticFish - 7:43 am on Oct 3, 2013 (gmt 0)
1) 'noindex, follow' the near-dupes and mention the options in the product description for the page that you do show to Google
2) use rel=canonical or Google's url parameter tool to try to amalgamate the pages into one virtual page for Google (N.B. not guaranteed to work and the parameter tool should be used carefully)
I think 'condensing' products and having options instead of multiple products is best for humans too though, so I'd look to get the CMS tweaked.