Great composition and tonal texture, composition is really nice.
I think the strings are a bit midi-ish for what you're going for.. which is always tough to solve without real instruments. Heh the reason I bought a cello was for composition, I figured it can play in the majority of the range and I can just double it down.
One thing about violin family instruments - you can usually rent them and have the rental fees go towards a purchase. Even the cheaper student ones still have so much more dynamic potential than a virtual instrument.
Just a thought - that's how I ended up with a cello.
Great work! :)