We're pricing out a EMC CX500. My co-worker suggests we go with 10k drives due to heat. I suggest 15k for performance. What do you suggest? Its for a large database. Is heat REALLY all that much of a difference that you would suggest going with a 10k vs 15k? Or can possibly providing a little more ventilation cure that problem? Performance and Reliability are obviously our most important factors. :\ Thanks!