G6s
That 4-in-1 server box isn't hot swappable, unfortunately so if you want to remove a "blade" from it you need to take down all 4 nodes.
Also I'm excited about the DL165G6 because it has optional, factory-integrated 400W redundant power(the option is buried deep in the spec sheet). Not field upgradable, but better than nothing. We were/are looking at the Dell 1435 for some things though the DL165G6 blows it away in better management(1435 has shit for management), hot swap drives(Dell lacks this), as well as the redundant power option.