I am a photo newbie. I have $400 to spend towards bettering my photo gear. I have the A700 with the following lens, 18-70mm and 75-300mm Macro. I also have the Sony HVL-F56AM flash. I am currently using a Manfrotto monopod with the leg attachment. My question is, should I get a tripod or a better lens? I have kicked both around and have no clear answer. If I get a lens, I was looking at the Tamron 18-135mm Macro lens, but am also open to suggestions. Your input would be appreciated.