Jig selection (blanks) are pretty poor in most cases around here...wrong sizes, wrong colors, cheap hooks...etc.
I pour my own jigs around gami jig hooks, powder coat them, and tie them up with all sorts of material...I don't think A&N will have much more than the blank jig heads.
Once you have found some heads you like, head to the fly shop for dressings. I got a good deal on a bunch of rabbit and some feathers from that shop thats closing down...they still had some material left too, may be worth a visit.
In terms of jigs, I like 1/4 and 3/8, those are my most common sized jigs. I pour them on hooks ranging from 2 - 2/0. Good luck, jig tying is fun and with all the different materials and colors, endless possibilities exists!
Oh, I read that a good rule for marabou jigs is 3 plumes minimum with one contrasting color..