I've heard the extra 3 inches pays off when you need to clean the enclosure but be ready to wait 16 weeks to get the enclosure (I believe the T8 is available via Quick Ship).
I had an RHP sent to AP for them to install. Also opted for the glass doors w/ lock and the LED lights. I was a little surprised the LED lights did not come w/ a switch. You basically have to plug/unplug the cord to turn them on/off.