I think in your sitation, going all out with the complete Special Edition bundle would be overkill.
Given that you still have to find your way around writing, orchestration, working with sample libraries etc., having only The SE1 would already take you very far. It covers the basics of a romantic-era orchestra by itself. It's got everything you'd need: solo strings, big string ensembles, all the standard brass instruments, all the usual woodwinds and a bunch of idiophones and orchestral percussion. Expanding the palette of articulations with the SE1+ would be the next logical step, but SE1 alone can already get you very far.
Since you already got the Orchestral Essentials 1+2, that's a lot of additional flavor and interesting combination patches you can further enhance the base of your "realistic" orchestra with.
VSL samples are very dry, yes. That makes them very playable, very programmable and versatile. The downside is that it takes some work and good ears to put them in a nice-sounding space with reverberation. On the other hand, getting the MIRx software is a rather cheap and simple way of getting that out of the way.
I'd say, take small steps at a time. The better you get at writing and programming, the more you will get out of any sample library. Having all that expensive stuff lying around and taking up terrabytes of storage space won't really make you write more or better music. The better and more experienced you get, the clearer your needs and further purchase plans become. Buying the Special Edition Vol. 1 for starters seems like the sensible way to delve into the VSL world and see what it does for you.