You are risking too much. I'd sell at least half, not buy more. This stock is a speculative trade, not an investment, until the company shows it can survive 2010. If you really want that much exposure to SNV, sell half or more of your shares and buy call options. If the stock goes up, you'll make very good money, but your risk is limited to the money you spent on the call options.
I'm half afraid to own this stock over the week-end for fear the FDIC will close it down some Friday and wipe us out. It happened to me with Wachovia the night after the CEO appeared on TV and assured us all they were in good shape.