Crazy christmas cabaret... input please

[Nixpus]

Ive been assigned a really nice task!

Every year at the company where I work we have a huge x-mas party for all of our kids. And like any other company of a reasonable size we have a pretty big x-mas tree in the lobby... with alot of empty gifts underneath. However one of the gifts is not empty. Its alive!

Inside is a standard cheap toystore car and it always ends up breaking. Its hard to be a 100$ car inside a x-mas gift when you have 10+ kids constantly chasing you around. Doing their best to push you the opposite way of where you want to go mkay!

So this year we want to do better... Personally Id try to find a cheap savage chassis of ebay, make a brushless motor mount and power it via hobbycity (radio, motor, esc & batteries).

But what would you chose?

Some of the requirements:
Highly manouverable - if we could have tank style handling it would be pretty cool.
About 8-10 miles/h (dont want the kids to get hurt).
Tough drivetrain.
Plenty of torque.
Long runtime.

Any bright ideas? :)

Pictures of last years rc gift... car is scrapped.