Your temperatures are normal. Some people have better luck with their cases and manage to keep their XP's at 50 celsius max, but mine used to run at 60 celsius full load normally. I bought a Volcano 7+ for it, and now it runs at about 55 celsius max.
In other words, you're fine, but it definitely wouldn't hurt to buy a Volcano 7+ or 9+, or any aftermark CPU heatsink fan that ya want. It would also let ya overclock a little.
-Lasereth