I wouldn't listen to anyone who says it's safe to sub components in a shotshell. A shotshell usually has a "hot component" so to speak that makes the load work well. Subbing introduces variables that you simply can NOT control. I watched a browning auto come apart once in a teenager's hands because his Pops really didn't care about hulls and played the mix and match game. Worked for a while I guess, but he eventually blew one up.
As far as wads, I'd look long and hard at card and filler with a protective shot wrapper if you only want one stock on hand. Precision reloading has a good supply on hand. The biggest problem is loading data can be sparce... You get it right though and you can use buffer and attain 90% patterns at 40 yards. I've seen it happen and knocked down birds at 70-80 yards because of the loads. Lay in your own flour supply though; your wife will be peeved when she tries to bake something and all the flour is in the shotshells..
Personally I usually just have a supply of rem sp or rp12 wads and some win 1/14 oz. load knockoffs around. I haven't done card and filler for a spell.
As far as best hulls, remmy and win aa are some of the best. Fed gold medal hold a bit more and you may be able to load a decent 1.5 oz. load in a 2 3/4" 12 guage..