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With weak light and a "sharp sports look", that suggests 60i. More light, better fast motion.
I like 720/60p for sports, you can then use Panasonic's free Frame Rate converter tool for DVCProHD (its a free plug in for FCP, I don't know if its available for the PC) to convert the footage to 30p. This way you can switch to full 2.5x slow motion at any time.
Also if you're comfortable with pulling focus on the fly, I highly recommend memorizing some focus marks from your position (IE Free throw lines, baskets, each corner, top of the 3 point line, half-court) so that you can manually pull focus. This way when you zoom in things will be in focus most of the time.
Otherwise 60p or 60i have the most responsive auto focus settings.