I doubt you've tried
every Kontakt instrument, because there are literally thousands of them. Many are very high quality (not so much the bundled library, though). Kontakt is your best bet for one all-around solution.
There are dozens of high-quality pianos available for Kontakt, some of which (e.g. Sampletekk) are also inexpensive. There are oodles of pad libraries for Kontakt, more than any other category. Of course, Omnisphere is the king of pads, as mentioned previously. Omnisphere + Kontakt is a great combination if you can afford them both.