at what print size do you normally keep them... i thought of doing it in A3 but i am not sure whether my resolution will be enough esp i do a lot of cropping.. some i crop as much as 50% of the pics... probably roughly A4 size will be good..?
Well it depends on how much you want to spend. If you shoot a lot and have lots to print, large sizes can be expensive. I suggest A4 or smaller. I usually print in A4 or 4R. 4R is easiest for sharing and of course most convenient for storage. A3 is pretty hard to keep.
Actually you don't have to bother much about resolution, unless you really crop your picture into a tiny bit. A 2MP pic at 300dpi is roughly good enough for 4R.