I want to say yes but I haven't used the 212 and your ambients are pretty high. I get great cooling with the rosewill Thor V2 case. I think better than the haf and you may want to consider a beefier air cooler as the 212 is in the middle. I have a zalman tower cooler that takes 2 140mm fans. your target overclock isn't very high though so it may be OK. let others weight in on it
I expect you'd be able to get such an overclock with stock voltage or a very minimal bump in voltage, as such I expect the Hyper 212 would be enough to keep the temps in check, if you already have the Hyper 212 then atleast overclock your CPU and see what the temps are like before splashing out on a new cooler or case.
As I mentioned, that I'm planning to buy a fx 8120. I've read that these fx chips are really good at overclocking, hence I was planning to buy a hyper212+ and overclock it.
But my major concern was that with such high room temperature, can the hyper 212+ & a good case (e.g. haf 912 or cm 690 ii)keep the cpu below 55'C(or max temp.) under full load.