Future 76CS owner here, last week I received the City Select and Topo maps but the box did not contain the 76CS, only a note saying it was on back order.
Anyway narrowed my search to the 60CS or the 76CS and decided on the 76CS after months of looking because of AutoRouting and the larger memory. I also do a bit of sailing and hope to load charts in the future.
I too would like it to hold Topo maps along with selections from City Select. I considered waiting for the Cx series but I think I've been chasing the new technology for far too long and it was time to buy. Also didn't know for sure when the Cx will be released and at what price.
I must say with all the handheld styles out there and their options, it would be easier to choose between a Ford or a Chevy.