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From what I tested and which gave me a bit of fun :

Reaper mod The Reaper mod replaces the standard blimp with the intimidating alien spacecraft from the Mass Effect series;

Raven Rock - The Raven Rock mod plops an entirely new island on your map;

Railroad engineer - All aboard for some major destruction !!!

Planet Express Ship - some fun whit Futurama

My experiences with Alienware have all been pretty bad. The customer service is terrible, as stated above, and they're very overpriced. If you don't need a laptop, building your own desktop will be far cheaper and you'll get a lot of freedom to upgrade it in the future. If you need a laptop, I'd look for another company, like Asus.

For this price i recomended Gigabyte R9 390 Gaming G1 ; R​adeon R9 390 establishes effective competition with the GeForce GTX 970 , at least if we look at the standard clock of both devices. And big + for Fall in your budget

I recomended BenQ XL2730Z

+ Gaming performance is exceptional;+FreeSync works superbly;

+Loads of useful extra features;

+ Good image quality for a TN panel;

27in, 2,560 x 1,440 TN panel; 144Hz maximum refresh rate; 529 $$ on amazon

CPU: Intel Core i7-6700K BOX

CPU Cooler: Thermalright HR-02 Macho Rev.B

Motherboard: ASUS Z170 Pro Gaming

Memory: 2x 4GB Corsair 3200 MHz CL16

Video Card: Palit GTX 980 Ti JetStream

Power Supply: XFX Black Edition XTR 550W

SSD : Crucial MX200 2

HDD : WD Red 2TB

+ Samsung SH-224FB

All for 2010 $$.