Probably not more than 5,000$ before taxes. I do not need a monitor or any stuff (I'll probably get a new keyboard from some local store, and I'm good for a mouse). So just the unit.
* Vekseid could build a rather nice server for Elliquiy with that >_> <_<
Given the depreciation rate of top of the line hardware, I've generally taken the route of buying a good motherboard with solid upgrade options. Looking at Dell's site... god damn. "Future proof your system with a 1.1kw power supply!" ... wtf. Naturally, you can't buy an SSD as your main drive with the Aurora, even though it apparently supports better RAM than the Area 51.
This is why we like to build our own.
You may want to consider going halfway - buy a stock XPS 9k from Dell, grab a high performance, high-density SSD, set that as your primary drive and do a system restore to it. >_>
A couple years down the road, pick up the 24gb of 1333mhz DDR3 on the cheap. You'll probably want to buy a better video card too.