I know 80mm seems to work fine for portrait work. If you check out my gallery, the two portraits I have there were taken with my AE-1 and a Sigma 39-80mm f/3.5 FD lens out at 80mm and lens wide open using natural light. There's not tight budget that I'm adhering to because I'm just going to start saving up all of my extra money to do this. I might be able to have about 50% of what I need sometime around September. I'm not sure if I'm going to use any of the extra money from school or loan money to help get it sooner or not. Right now, I'm just in the research and planning phase. Looking at the startup costs, I shouldn't be making half-hearted purchases and regret them later. I think I'll try to see if I can get the EF 50mm 1.4, EF 100mm 2.8 macro, and EF 28-135mm 3.5-5.6 IS USM. It may be until the end of this year, but I'll try my best to save as much as possible.