' orchestral plugins' Do you mean a whole symphonic orchestra as ONE preset? or clasical single instruments like 'violin' 'english horn' aso. The latter is something most vst has some of.
A start could be to try some of these
https://lmms.io/wiki/index.php?title=Tested_VSTs
But Synth1 is exelent, and a lot of clasical instrument plugin, can be found for it,
http://www.geocities.jp/daichi1969/softsynth/
I dont know any that has full symphonic orchestra in one preset.