What do you plan to store on the SD card?
Store images, primarily. For UAVs to be a viable theme for me to work on in my thesis, I can't expect it to always have a connection with a computer or something to send the information to. Not sure what information I will make it gather, but I expect it to be primarily images, but possibly also coordinates (position + altitude).
What are the cameras for?
Primarily gathering information in some way, that will be processes by a computer.
What WiFi unit do you plan on using? What range does it off/do you expect?
I plan on using XBee Pro 900 maybe. I have never worked with this stuff before, so I basically don't know nothing about what alternatives are good. Basically, the longer range the better, but I think 10km is a good start. Don't think I'll have too much use of any longer.