Which Engine????
 

I am looking to put a high-end .12 engine into my HPI RS4 3 EVO.
I have come up with three engines that look like they are what i need They are all within $25 of each other

They are:

A Novarossi N12LL5
A O.S. .12 TZ (P)-T 5-Port Turbo
A Serpent MEGA M12 LEGAL SPORT

Do you think that i should change this list and add another engine or take off one????
If you think these engines are all good choices which one do you think i should choose???