I've been involved with FRC electrical since 2005, so I feel I have some experience here.
Greg, I think screw terminals are fine. My only nit picky thing with the Sparks was the PWM retention. I really like how the old Victor 888s did it with a full enclosure around the connector; however, that comes at a cost of having straight PWM pins that slip into place.
I'll be the first to admit that our robot's electrical wasn't great this year. It worked... but the wires did jar around with the defenses and we have had the PWM cables get tugged. We found that the PWM cables going to our Sparks bent. If it was a straight tunnel case, I don't think that would have happened.
I'd say the PWM cables are adequate because... well, you have to have PWM cables for the RoboRIO as well.
Now, for the Spark 2. Can we can some CAN? I like the Weidmuller connectors, but at the same time, I don't mind screw terminals. I think you could pull off a full CAN connector that binds the wires between two plates that would achieve the daisy-chain topology of CAN. I'd very easily pay $10 more for CAN integration, and I don't necessarily care about all the crazy features the SRX has. You'll have me happy with speed, direction, brake/coast, and limit switch control and feedback. I don't care about current (I can get that from the PDB, I don't care about voltage control, current control, motion profiles, etc...) I do care about reducing the number of wires on my robot and making it more reliable.