Go with a Mec 600 jr. I have a 12 and a 16 gauge version and both have seen 1000's of rounds.
Hulls- I like Remington gunclubs. You should be able to get buckets free at any trap range. The last a long time and are one piece. The AA are still good but have a disc in the bottom that some people claim will dislodge after several reloadings and get caught in the barrel. The next shot will ruin the barrel. I still use AA for some loads but always look down the tubes of my guns before reloading.
This is link will be very helpful
http://www.shotgunworld.com/bbs/viewforum.php?f=13&sid=17f3fb6d9d0cc88d1d6bb9923362e562
