[What is the Best Engine for Mass drivers?]

Ok so im planning on making a minmus base and i want to use a mass driver to transport recently fueled ships into Interplanetary space. I need the Strongest Liquid fuel engine for the driver. I need something with the most efficiency to launch a payload up to 200lbs. This mass driver will be used to establish other bases.

[KSP enhanced edition versions]

I'm just wondering if the Enhanced edition complete the one for like 60 dollars if I remember is it on 1.12? 

 

[Life from other Solar systems (if not alr suggested)]

Idk thought it would be cool for a different species to exist in the new systems idm thought this would have been a cool idea

[Land on every Planet/moon]

Wait i gotta edit this if its already been done

 

[Land on every Planet/moon]

Land on every Planet/Moon including jool at -249m with a satalite in orbit around Jool,Duna,Moho and return to kerbin safely