Been using a Precision T3400 for the past few years and decided to upgrade. Went with an Alienware Aurora R4 for $1304.25 after coupon.
Specs include an i7 3820, 16GB ram, 1TB hard drive, 2GB GTX 680, 24x DVD burner, blu-ray drive, card reader, and TactX mouse & keyboard. I'm in the InfoSec field and the power of the GTX 680 is insane when it comes to forensic data carving and auditing password strength - it has 1536 Cuda cores!! Not a fan of the hard drive but I have 4 SAS drives going in instead. The CPU is fine for now but will probably upgrade to a 6-core 3920k in a year or so when they get cheaper. Overall I'm happy with the purchase.