SIMPLE!
I always like to show this as an example:
http://www.team639.org/pics/2002_goal_grabber_10.jpg
How many moving parts did everyone's goal gripper have last year (and if it ever let go without you wanting it to, it doesn't count)?
If you can do one thing and do it well, YOU will do well. Best to focus your energy on one thing and have it work, then have 5 amazing sub-systems that break down every match (this is my opinion). Some of the larger teams can pull it off, some teams even build more then one sub system and make their robot modular (I personally don't think this should be allowed by FIRST, but I understand why it is).
K-I-S-S ME!
Greg