Thanks for mentioning the Wiseco ring compressor Steve. Same thing as the ARP and quite a bit cheaper!
http://www.wiseco.com/PDFs/Wiseco-CompressorSleeves.pdf
Also agree the Stomski injector is the hot setup. Takes a little bit of practice to get the feel for inserting the clip into the tool and also how to best "pull the trigger" to snap the clip into the piston. But once you get the hang of it, it puts a smile on your face every time. No more gouging pistons with picks and screwdrivers during circlip install!