I have:
85mm 1.8
30mm 1.4
50mm 1.8
(and one of those zoom lenses I never use)
Kendall - I would NOT recommend the 85mm 1.8 as your first prime lens. The lens is AWESOME, and I LOVE it, but it's not a good all-around use lens for crop sensor cameras. I use it every chance I get
outdoors because I need to be farther way from my subjects to be able to use it, but sill turn to my trusty "nifty fifty" most often because of the versatility.
If you're narrowing it down to two to chose from, I'd pick between the 30mm and the 50mm
Also, for sports photography...if you're going to be in a gymnasium with crappy lighting, (or even outdoors at night?), you still won't get good pics, even with a zoom lens. If you'll be taking pics in good daylight, it might be worth it - I do use mine
sometimes when I'm trying to "sneak up" on the kids to get pics outside.
Your best bet for action shots with challenging lighting is to go with something like the 30mm lens and try to get closer to your subjects. Your prime lens will let you open up your aperture to utilize more of the available light than what a "cheap" zoom lens will. And the 30mm will still let you get lots of action in the shot, even if you are close-up (which is why it is a favorite lens for most folks!!)
good luck!!!