You really should be heading to Kara before you think about ZA. Even with the nerfs, you still need good gear. More important than your gear, is the gear of the rest of your raid. You could be carried through ZA with some very well geared(t6) healers and dps.
I run 2 ZA's a week for my guild. Since the nerf, I solo tank it with the exception of 3 times. Bear boss, Lynx boss, and Dhawk boss. There I have one of our ret pallies or dps warriors eat the bleed/cleaves/hatchlings. On Monday I had our other tank MT it, I was OT the 3 times I needed it and still pulled 1200 dps overall for the run. So yes, it is nerfed big time, but a 15k cleave on Lynx is still a 15k cleave.
I would run some Kara's and try to get into some other t4 raids, Gruul's and Mag's for some upgrades and badges before heading into ZA.