Why are you getting in to modular? Sound design? Getting away from the computer? Composing? You can have more than one reason, and they can change, but it's good to lay out a bit of a vision first, to help guide your decisions..
How big a rack to eventually want to head towards? If you want to have something small, then maybe the 2S and rackbrute would be all you ever need. If you want eventually build a huge rack, then a the Moog and and a 6U rack is probably a good starting point, because you can resell the rack and get a bigger one later.
Are you interested in playing the rack at all? Or just controlling it externally? the 2S is probably the most playable option you've put forward. The SV1 or 0-Coast would need a sequencer (could just be your outboard devices).
As for starter modules, you probably want modules that don't duplicate functionality of your semi-modular. Wasp is cool, but you will already have good filters. The Moog has a noise source. EG is a good idea. Passive mults are useful. An extra VCA or two would probably be useful. It's probably not a terrible idea to think about a Disting mk3/4, because those things are small, can do nearly everything, and you can use them to figure out if you really need that new module that you think you need..