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Yeah, you definitely should go! You won't regret it. :)
And about the bus, as far as I remember, when you buy the tickets it's all included,
The cable car(it's not in the posting, but we took one on the way up there.), and the bus.
I went there in summer of 2016, so it could be little different from now.
You should check out this web site. Hope it helps. :)
https://www.alpen-route.com/en/

thanks so much for all these tips!! I really appreciate it 😁yes yes I will aim to visit by 2019!! Moreover I havent even seen a speck of snow before. this will be absolutely amazing kekeke