personally, i am not comfortable with that temp (even if max is 100 or whatever)
60+ is ok, maybe 70 max.
maybe you could try 3.8? or 3.9? check how 100/200mhz lower affects the max temp
Scythe katana 3 is a good over the stock Intel, but not good enough for overclocking.
The Cooler Master V6GT is a better cooler if you have it, but the Cooler Master Hyper 212 EVO is the best bang for buck cooler that can handle an overclock.