keith
One thing you might consider is getting one of the "light" LD libs, like LDi Select, which is only $19.. use that to get your feet wet with emulating guitar on a keyboard/in a piano roll/etc.... Then when you're at a point of realizing "what you're missing", you'll be better prepared to understand what exactly the bigger and more featured libraries provide. Just a thought.
I have quite a few of those $19 Lyrical Distortion libraries I bought very cheaply in a sale and you are correct, as good as they are they show you what you are missing. I don't really know much about their larger libraries.
I think Orange Tree is very good with a very comprehensive rang of articulations and features. I have both Strawberry and Steel Strings I have the to try the updated Strawberry yet.
Indiginus is a company worth checking out. Torch and ACC are not a fully featured as Strawberry and Steel Strings, but is simpler and very effective. Good value at the price.
You should look into guitar amp simulators too. Torch is better through Amplitube of Guitar Rig than using the built in effects, I suspect that will be the case with the new Strawberry too. Kontakts amps and speakers are OK but do not match a full package.
Ilya Efimov looks tempting but I should concentrate on getting the best out my OT and Indiginus products first. Of course I could become the Nigel Tufnel of virtual guitars.