Mike, you'll do good getting the CT, cause you got to remember it is a Pro-x cylinder & those cost 2 times what an ESR top end will cost. Even though it is their basic mid range porting, it will be quite a bit better than the regular generic porting of the ESR cylinders, but If Eddie does the porting himself, then the ESR would be a match to the CT cylinder.
Far as performance, find out how much compression the cylinder has & if its kinda low, up the compression & you should be well pleased with the performance. Have the cylinder ported again for like say upper mid range & the valve will give you pretty good bottom end, but when the valve opens, hang on cause your going for a ride.
Neil