I searched other places in the forum I hadn't tried before and got some useful stuff there. Thanks a lot to Jamie and his speed controller guide I found.

4 x 18V motors, overvolted by a 24V/6S LiPo, controlled by 2 x 24V/85A ESCs.

Turnigy 3000mAh 6S 30C Lipo Pack
RB-775-18v Brushed Motor
BotBitz 85AMP Electronic Speed Control (v2)

https://hobbyking.com/en_us/turnigy-...lipo-pack.html
http://ranglebox.com/product/775-18v-motor/
http://botbitz.com/product/botbitz-8...ed-control-v2/

Two more questions though.

Is the LiPo I picked safe to work with the ESCs or should I find another one with a lower mAh rating?
What sorts of gearbox would be recommended for the motors while Ranglebox is out of stock on the Saturn-16s?