First off, you don't want give, which is why people run gear drives. Seconded, the amount they heat up the oil is very little. My boss has one in his race-built 347, which he runs up to 7.5K/8K and he has NEVER had a problem with oil temp. Finally, they do make quite gears that don't make the whined noise. The only problem with gear drives is they are harder it install (some require proper lash settings and some mechine work).
-Shaun