You can click on the saltwater link from this page to check out the full list of rainshadow saltwater (SW) blanks. I'm not sure about the models you are referencing but I'd guess that they are all referring to the same blank.

http://www.batsonenterprises.com/rodblanks.php

Is it better to get the blank or get it wrapped already... Well as far as I know, Rainshadow does not make pre-made rods, they only make the blanks. So if someone is selling a wrapped rod, they must have wrapped it themselves. There's no stock Rainshadow rod like there is with Loomis for example.

Florocarbon... I see it like this:

For lighter baits, murky water, or surface applications, I use straight 25lb mono.

For heavier baits, clear water and/or subsurface applications, I typically use a florocarbon leader.

I've experimented with fishing straight florocarbon, and it is OK. But I don't see any real advantage in it when you could spend a lot less money and just tie in a leader. It's not like you need extra sensitivity in swimbait fishing! And I happen to like the stretch in mono because I feel like it's less likely to tear the hooks out. To me, the stiffer the line is, the easier it is to throw slack in it and the more likely it will be to tear a hole in the bass' lip. I've experimented with florocarbon for regular bass techniques also and as time has passed, I've found that I only really like it for crankbait fishing, and light line techniques like small jigs and small worms. I don't even really like it for drop shotting even though it's supposed to be the hippest thing for that technique. I guess overall I just try things for myself and decide if it works for me. Its easy to get caught up in the hype of new technology products, but just because something is new doesn't mean its the best :)