Probably not unusual.
I have a 1200/266 on the same MB. Initially, I ordered a VolcanoII (best cooler from the site I ordered CPU from). I was running in the high 50's to low 60's (when the room was cool).
Changed to a WBK38, got things down to the high 40's, low 50's (w/delta 38 and ASII). Room was still cool.
Couldn't handle the delta38 whine, put the fan from the VII on - temps rose a couple degrees.
Then summer came to NJ - room is now >5C warmer. Temps were hitting mid-high 50's again. So, I just put in a Swiftech MC462 with the delta 80mm. It peaks at 45C after a couple hours of heavy load, but its noisy. When summer is done, I'll be putting a Sunon 80mm high-output on the swifty.
When comparing my temps with others around the web, I have to conclude that the MSI board reads temp at least 4-5C higher than others. So, you probably shouldnt worry, but you can do better.