What is best servo for CRT .5?

Well I bought a crt .5, when I purchased it I was under the impression that the extended chassis that is installed would accept a 1/10 servo...no such luck. Now I need a servo that fits. Something that is best bang for the buck and good performance.

I know I could drill the chassis but I would like to run this thing to see if I even like the way it feels before drilling on the new chassis.

BTW I am running a Team Blue Groove chassis and conversion.

Thanks guys.

Paul