I'm in an undecided decision and require some help. Currently, the Sony HVL-20M flash has been newly listed on Craigslist for $110 in like new condition. Also, the SEL 50mm f/1.8 is available for $200 shipped from a private seller. Which one should I get? I need to act on either one of these fast and need a quick reply for help. Any suggestions will be greatly appreciated!