There are a couple of samplers which have high quality third party libraries.
Kontakt is very popular. The reason why someone probably recommended Komplete is because just buying Kontakt for $400 (unless you get it on sale) doesn’t make any sense when you can get Komplete for $500 (which is Kontakt plus several good libraries plus a BUNCH of other very good stuff). Kontakt, Reaktor, and Guitar Rig alone would be worth it… The rest is bonus.
You could even use the free Kontakt Player with some libraries but I think you will find it limiting.
Two others, which I have never used, are the East West Quantum Leap and Vienna Pro. I don’t know much about them but they seem highly regarded to me.
HTH