Yes, going to use stock cooler. I may in the future if I want to have some fun hacking up the case. Making a side window, with a 120mm side hole for side intake. Yes, and I was thinking about removing the whole grey part because you can, and then getting 3M Carbon Fiber Vinyl. So I got one of the LEDs i got to go into the holder, the 5mm one. The 3mm is still to small to go into the other whole for the hard drive activity LED. I guess Dell might have used a 4mm LED for that, and I cannot find and LED that size for this.