I've got $800 to spend on Ikelite products (photo scavenger hunt double win) but sadly I'm already a Nauticam/Inon guy. Figured the best option would be to get a good strobe and sell down the road. Ikelite has the DS161 on sale for $799 and the DS160 for $649. Looking at the products, I'm not seeing much of any performance difference between the two. Not sure whether to get a single DS161 or get a DS160 and spend the extra $50 for an extra battery. What's the advantage of the 161 over the 160 and any advice on which way to go here.