Armor Quints aren't really the greatest unless you're jungling Amumu or something. Flat HP quints work great on all champions, including tanks and AP carries. Since you haven't mentioned that you play any AP carries, I'd go with Flat HP over something like Flat AP, since they're more versatile and nice for tanking. Remember, tanks get survivability items very quickly, so it's the early game that needs a boost. The rest of your runes sound fine.
One more suggestion:
Greater Seal of Scaling Mana Regeneration or Greater Seal of Replenishment are also some of the best runes out there. They are very cheap, and well worth the price on mana hungry champs.
One more suggestion:


Thanks to Jovy for the sig!
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Anyway, I am setting up my rune pages. As of right now, I have full Tier 3 ArPen marks and full Tier 3 MPen Marks, then full Armor yellows, and full MR per level blues. Sadly, the only tier 3 Quints are ArPen (3) and Attack Speed (1), cuz I was really playing alot of jungle olaf and jungle GP when I was leveling up in the 20s.
So my question: What should I purchase next? I have about 5k IP built up, and want to make some smart/versatile rune purchases. Right now, I play alot of: Jungle GP and Olaf, Singed, Nasus, Janna (when I play support). I am thinking of maybe trying to really start practicing as a tank, so I dunno, maybe some good tank runes. But just any ideas on what should be my next purchase as far as runes go? (I was thinknig HP quints.....but they're SO expensive ;))