Max core temp for i5 2500k

It is a little high for a non-overclocked system but nothing to worry about... IMO.

You should be good to go, just monitor your temps from time to time to make sure they aren't running hotter.

Actually they are fine dude, i just bought an i5 2500k with an asus maximus gene-z board using an a50 corsair cooler, my temperatures are practically the exact same, your room temp is a bit better than mine. at a full load at 3.7 GHZ and 37 multi, it sits around 45-48C. hope this helps.