I have yet to mix any kind of multi-track recording that doesn't need at least _some_ EQing on more or less every track - sometimes just to tame a resonance which builds up only in certain keys, or to get rid of low frequency build-ups, sometimes aiming for massive changes to get things working with (not against) each other.
I use compression lavishly, most of the time just very soft ratios like 1.2:1 to glue individual samples, but sometimes quite aggressively, especially in case of percussion or solo instruments. If in doubt I write some automation*) moves instead.
Saturation builds the bridge between the frequency and the dynamics domain as it changes both aspects (dynamically, one should add). Sometimes I use it just for more "interesting" textures (mostly in the treble range), sometimes for more even loudness (which is a result of the louder harmonics). I _love_ distortion, but you really have to have your act together to use it fruitfully in an orchestral context. ;-D
It doesn't make sense to do all of this in solo mode, though. Listening to tracks in solo is useful for restoration work, not so much for mixing. All the beautiful bass will be too much when it appears on all tracks, for example. ... this is the reason why I don't really believe in the idea of so-called "pre-mixed" samples, because this would mean that somebody has magically anticipated all your arrangement- and performance-decisions. 8-)
(... yes, I write that as the guy who created myriads of MIRx-settings for Vienna Symphonic Library :-P).
Starting points - yes. Prêt-à-porter - no.
Reverb and any kind of spatialization is something that has to be applied to individual sources in context of the whole mix, too. For me its highly connected to width- and panning decisions, as reverb is the only straight-forward way to achieve depth in a stereo setup (... and in surround, too, to a certain extent). Don't hesitate to automate*) the "wetness" of instruments or the whole mix. If done properly this will add motion and "drama" to an otherwise static mix.
*) Automation is the key to any vivid and emotionally compelling mix in any case.
Finally, don't underestimate the possibilities you get from mix bus processing. Personally I tend to "mix into" a quite elaborate bus chain all the time. Its actual setup depends a lot on the job at hand, and it is nothing that is set once and left untouched for the rest of the time (quite contrary). Still it makes live so much easier, as I can spot weak points where they really hurt (in the mix) and fix them "bottom down" in the source track(s) thereafter.
That's an example of how it sounds when I combine real (life) orchestra and some samples, using the approach outlined above:
EDITED for valid YouTube-link.
Have fun!