I say Newground. Sounds like something that would be appropriate and there'll be something in space called Newground. And half the suggestions will be rejected anyway because of this bit on the rules:
NASA will take into consideration the results of the voting. However, the results are not binding on NASA and NASA reserves the right to ultimately select a name in accordance with the best interests of the agency, its needs, and other considerations. Such name may not necessarily be one which is on the list of voted-on candidate names. NASA's decision shall be deemed final.
So yeah, Metal Gear and Battletoads aren't quite gonna make it.