If you have defense at least 540 (whh you do) and have around 22k health and armor unbuffed (whh you do) you are ready to at least START heros and probably do some
of Naxx. Mostly it is a question of being experieed and having a good healer, as well as doing the easier heros (like Nexus) before you do the harder ones. Have you been Prot before or did you just resp at 80? If you just respced, you probably don't have the experiee to manage pulls and keep everything underontrol that you would
if you had been Prot for quite a while. Also, for heros you have to have a darn good healer that knows extly what they are doing. If you are new to tanking, I would rommend doing some level 80 non-hero dungeons just to get some tanking experiee. Your stats are fine for several heros (see a thread that ran a while ago about whh heros are easy and whh are hard in WotLK) and they will improve even more as you upgrade your gear. From what I hear, several wings of Naxx are not too hard either, but some are, so you may want to plan a Naxx run with that in mind and do the easier parts first and hope for some gear upgrades. If you have been Prot for some time and are used to it, just make sure you have a healer with a good amount of spellpower that knows what heshe is doing and
the easier heros shouldn't be too bad at all.
Your stats are fine, better than mine when i hit 80(hell i'm still using 4-5 pies of lvl 70 gear) and immediately ran 3-4 heros. Have had 0 problems with threat or survivability(even with my dps oriented tank sp), just have to bring a healer that knows how to deal with hero damage.
