Upload & Sell: Off
You are correct in the fact that there are lots of ways to get a good setup for indoor basketball action. Since its HS, I presume you have no problem getting close access to the floor, which should influence your buying decision (IMO).
I prefer to sit on the baseline whenever possible, as it opens up the action to getting pictures of the players faces. I also shoot basketball in portrait orientation 80% of the time.
From the baseline, you need to be somewhere between 50mm-120mm in portrait to cover the offensive end (i.e. get the ball in flight, basket and floor in the action). Obviously you need to go longer if your covering the defensive end.
Given the ridiculously low D700 resale prices, I would definitely build my kit around the D700 with grip. From there you have a number of primes (50mm, 85mm, most obviously) that focus fast and that work great in low light. On top of that I would layer an 80-200mm zoom. Forget the VR, it costs way more and VR isn't going to help stop action or do anything for you in the gym. Outside shooting football and other sports VR isn't necessary either since you're going to be shooting high shutter speeds.
So for $3k you can build an extremely strong kit along the lines of a d700 w/grip ($1,800), 85 f/1.8 ($350), 80-200 f/2.8 ($850) that would be suitable for a variety of indoor & outdoor sports and smoke your current kit by a mile.
Later I'd layer on the 70-300VR and a 35-70 f/2.8 if you can find a good one.
This is how I would do it, but you know the saying about opinions.....