I currently have a nikon D70 and it takes beautifull pictures but as my business is growing I really want to be able to be able to provide larger portrait sizes. Currently I can pretty well count on a 16x20 and sometimes (it is a hit and miss kinds thing) I can blow up to 20x30. THis is great except for that I would like to very large family pictures like 30x40 or so. Also, I was using a continuouse light set and I absolutely hate it so I tried to go a cheaper route and bought and older strobe set (2 lights) that belonged to a retired photographer. To be honest they really aren't strong enough and alot of times I end up using my continous lights. Which problem should I address first, would better lights give me larger pictures and is the D70 model a good model. I am not exactly a beginner but definitely not a true professional yet so I really need some advice.