DSK Overture the VST is free, it is the many copyright free samples on the right that cost $25. You don't need those.
DSK overture is not bad. It allows you to layer up to 4 instruments in one instance and control volumes and pans of all four, so you get to create your own orchestral synth, customized, sort of.
I can see myself experimenting with it some.
At worse case, you have a free Rick Wakeman synth to play around with and that's not bad.