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I Have a D90 with the 18-105, 50mm 1,8 and 10,5mm. The 18-105 has good versatility but lacks in quality, it's fine but compared to the 50mm it just isn't as sharp.
Everyone should have a 50mm or 35mm in their setup like others say it's cheap and have great quality. And you can use it in skiing if you take the time to find angles and stay stationary (alittle more serious than snapping shots with a wideangle)
I can highly recommend the 10,5mm 2,8 fisheye it's super sharp and fun to experiment with. It can be a bit pricy but it's well worth it! You can find pretty cheap used ones, I got mine in perfect condition for 645$