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If you root the Sprint SGS3, you won't have to worry about OTAs, because they won't install. You'll download the OTA, it'll reboot into recovery...and then fail because it's not designed to work with custom recoveries. You have to install a custom recovery in order to root the GS3 (unless a new method is developed). So OTAs are not possible.
But the OTA will be converted into a flashable update to work with custom recoveries, but it may take a day or two.
but im not trying to install a custom ROM just root though
AFAIK, there is no filesystem exploit to install just root. You have to install CWM and flash a SU patch or a rooted ROM.
Evo, are you using the no-trip method? if so, then jerofld, he does not need to install a custom recovery, and if he wants to accept the ota, he can try voodoo rootkeeper, which should retain root access