we went with Telescope marine polymer furniture. the cushions slide and velcro on so they don't blow off, the furniture has been in full sun for a year and hasn't split or faded, I went with brown not white to avoid yellowing or tree stains although I think they claim it won't yellow.

and oh, it was crazy expensive but I wanted comfortable and durable and you get what you pay for.

If you go to the link below - section on outdoor furniture, it may help. http://www.installitdirect.com/blog/maintenance-tips-for-an-oceanfront-home/