e6600 stock temps

I recently built my first pc and I was wondering if my temps were ok. Using the program Core Temp .94, both cores idled at 30 C after idling for an hour. With dual instances of Prime95, they maxed out at 45 C. Is that alright. I would like to overclock to atleast 3ghz, but don't want to overheat. If those temps are too high, I need some help deciding which cooler to purchase. I would like to buy a tunic, but it doesn't fit in my case (Aerocool Extreme Engine 3T). Would the Zalman CNPS9700 be better than the Thermaltake Big Typhoon VX? What other coolers will fit? Thanks