An additional humble suggestion... it is for the interested new shooter to find what he wants to do, and ask of the organization what he should use to do it
by their rules. If he likes what they are doing, he can join them.
My strategy was to look at the various organizations I would like to shoot with (or might expect to have a chance to get into) and assemble my rifle and shooting kit to suit the most restrictive set of rules. By default, the more liberal rules would be met and I wouldn't have to change anything. If the prospective shooter decides to specialize in or concentrate on one specific discipline or organization, he will probably be upgrading his gear for that one anyway.
CatWhisperer, the categories you mention exist in ASSRA at larger matches. We just don't have enough shooters at CSV to offer every match that exists across the boards. If there is enough interest, I would love to have an any caliber iron sights match, perhaps at 100 yds for bench or offhand... if enough attending shooters request it, I will add it to the June program. That will give me an excuse to drag out another high-wall!
That's my story and I'm sticking to it.
Froggie
PS I also would like to reiterate what Jim said; The biggest reason these other organizations exist is that their founders wanted to do something different from what was already being done since the late '40s by ASSRA. That does not mean we have to change to accommodate their wishes, they have their own organizations for that purpose.