What kind of battery should I use? (Total Noob)

[llSourcell]

Ok so I'm trying to build a mobile base.

I already have a chassis.

I'm going to use 4 of these 6V motors
http://www.robotshop.com/productinfo.aspx?pc=RB-Sbo-39&lang=en-US

to power 4 of these wheels
http://www.robotshop.com/productinfo.aspx?pc=RB-Sbo-10&lang=en-US

and I'm going to use 2 of these motor controllers to power both sets of wheels
http://www.robotshop.com/pololu-qik-dual-serial-motor-controller-2.html

and both motorcontrollers will be controlled by one Arduino Duemilanove

My question is, what voltage/type of battery should I get to power this thing? 

I want it to run for one hour minimum without a charge and for the battery to be rechargeable.

[mstacho]

Well...that's a hard question to answer.  I would go for something like this: http://www.hobbyking.com/hobbycity/store/__8933__Turnigy_2200mAh_2S_20C_Lipo_Pack.html

These are RC hobby batteries, so they are designed to work with high current draw motors.  Problem is that they are 7.4V, which MIGHT eventually blow up your motors.  Most DCs can run above their rated voltage (they just run faster) but you shorten their life.  Your motor controller can take the voltage.

Another option is to just get a whole bunch of 1.2V recharge-able batteries.  My experience has been that these do not last quite as long as the RC hobby batteries, but they are far more standard.

MIKE