Well... lots of good suggestions in the previous comments.

I'd start with Native Instruments Kontakt. If you want a good starting point, and money isn't really an issue, I'd suggest the Komplete package from NI. Last time I looked, it had Kontakt and somewhere close to 10+ other synths. All with different characteristics and a ton of virtual instruments and sounds. In addition, there are easily hundreds of third party vendors who make unique sound libraries that only work with Kontakt. You not only get the basic orchestral and band instruments but you get a bunch of soundscapes, and other sounds that go into what it sounds like you're wanting to do.

In my humble opinion, you can not go wrong using NI as a starting point. They have a huge and ever expanding library of sounds, it is relatively affordable compared to other synths and libraries on the market, and the most important thing is that everything they have sounds good.

Many years ago, I picked up Komplete and have never regretted it. Huge bass synths, drums and percussion synths, soundscapes..... my only regret is that I don't write music that can use it to it's fullest.

I have a few other synth libraries.... East West, Miroslav, and a few other ones but the Komplete package is my go to synth when I need something unique.

As far as something sounding dated.... I think it's more a factor of how it's used vs the actual sound.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.