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If it were me, I'd also change the Master, Slave and clutch line. Not very expensive and then you're sure you have a whole new system. W/ a new clutch and pressure plate, it's not uncommon that the extra force required to move the new parts can cause the old hydraulics to go south.
I'd do these things before O2 sensors and even RMS (if it's not leaking, leave it alone for now). Spark plugs can be done anytime, so I wouldn't consider it a 'while I'm in there' item. Same with O rings, if the tubes are dry, leave them. They're just as easy to swap later. The thing with seals is there's a great possibility of getting the new seal wrong and have it leak in short order, whereas if you leave a dry seal in place, it's likely to stay that way for some time.
Cheers!
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