Just speaking for electrical, it's easier to make a removable electronics panel on the robot (and makes for a fantastic board that can be utilized in numerous practice bots) if you have powerpoles, and especially so if you can get them with the chassis mount and plug like so:
http://www.powerwerx.com/powerpole-a...ch-4-sets.html
(The part the plug plugs into is pictured on the same page but is a separate purchase)
Or if you have kids that are just plain interested in learning about electronic components, this is a great way to get them started, it comes with two books, tons of projects, and numerous parts to get them started and help them understand how things go together.
http://www.radioshack.com/product/in...=Learning+kits