I would take offense with your comment but since you own one you are biased. The only design of the x51 that is better then the Tiki is price. The x51 has an external brick, Tiki internal which is 450 watts vs 330 for alienware. Therefore the X51 is limited to a 660 graphics card which is mid level. The Tiki was designed over a year and was designed to dissipate heat and noise. It is two times more powerful and faster then the x51 when equipped with the Gtx 680, benchmarks are 3 times faster when equipped with the 550 card/x51. Lets see support, Alienware you will talk to someone in the phillipines who neither owns and x51 and is reading off a screen. Support for Falcon is 3 years parts and lifetime service, alienware you have to pay for the 3 years and after the 3 is up keep paying!. Construction, no comparison, rolled steel for the Tiki, liquid cooling, granite stand, it has been described as beautiful by reviews. The X51 is plastic, with a bicycle fender used as a light and a cheap plastic alienware figure on the front. Not something you would use at work for sure or with quality equipment. Now if you configured the x51 to its maximum with support and everything it would be 1500 bucs, and the tiki can be configured in its base for roughly the same, a little more. Spend 700 more bucs and you can build a alienware x51 crushing machine or regular desktop crusher.
Now if you only can spend 1000 bucs the Alienware is not a bad deal, I would go over to avadirect.com and you can build a similar machine with a bigger case, if you want the small case Alienware and Tiki only way to go. Now before you shout hater. I have one dell laptop and two Alienware Laptops!!! I am in the market for my first sff desktop and Tiki is at the top of the list, I have researched every sff computer there is. Also hot is the new Sg09 case and bitfenix is not bad also