Like LittleRiver said, it would help if you clarify your goals. You said you want to move from BIAB to all grain, but BIAB is an all grain technique. So are you really doing all grain now, or are you actually doing extract batches plus steeping some grains in a bag? If you are already doing all grain then by "more" it seems you mean you'd like to transition to a set up with more equipment? In giving you recommendations, is cost the main consideration? What equipment do you already have? Are you looking at batch sparging, or fly sparging?