jammin x1 cr witch motor? esc?

Hi im looking to go brushless in my jammin x1 cr. im not sure if i should go with the quark 125B or the mgm 160 ? both are $$$$. for a motor i was going to go with the neu but theres so many 2.5d 1y ect... could anybody tell me a good setup for this buggy. theres also the mm and a 8 xl that would be cheaper to buy but is it good? thanks