I am still using the original 25 ft chiller I had from my indoor brewing days. When I used it with a keggle, the keggle retained so much heat, that it was not a very efficient cooling mechanism, even when sraying the output water on the outside of the keggle. With my thin-wall kettle now, it does all right, but I still need to upgrade. I think if you are going to use keggles, you should probably upgrade to a larger chiller and/or incorporate a recicrulation system.
perhaps a line of single hop IPA's - there's so many new hops out there!!!