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New computer advice please...? - bd company free

I need a new laptop and want to have lasted for 4 years and keep up with new programs and games to buy. I'm not a great player is not World of Warcraft) (bought but in games like Civilization IV and the GPS, I computer I have now in 2006 and it is fruitless to try to run games and new programs on this subject. This is the material that I want to buy:

Alienware Area-51 m17x

Video / Graphics Card: Dual 512MB NVIDIA ® GeForce ® 9800M GT - SLI Enabled
Display: 17 "LCD WideUXGA 1920 x 1200 (1200p) with Clearview Technology - Black
Including AlienFX ® Illuminated Keyboard - Exclusive Design!
System Lighting: Alienware ® ® AlienFX Lighting System - Blue
Processor: Intel ® Core ™ 2 Extreme X9000 2.8GHz (6MB Cache 800MHz FSB)
Memory: 4GB Dual Channel DDR2 SO-DIMM at 667MHz - 2 x 2048
Operating System (Office software not included): Windows Vista ® Home Premium with Service Pack 1
Notebook Tuners and Remotes: Internal Digital / Analog (ATSC) MiniCard TV Tuner with Express Card Media Center Remote Control
System Drive: Single Drive Configuration - 250GB 7200 RPM (8MB Cache) w / Free Fall Protection
Optical drive: Dual Layer Blu-ray Disc Reader (BD-ROM, DVD ± RW, CD-RW)
Wireless: Internal Intel ® PRO Wireless 4965 a / b / g / Draft-N Mini-Card
Sound Card: Internal High Definition Audio with surround sound
Warranty: 3 years onsite service Alien Care and 24 / 7 Toll-Free Phone Support
Microsoft Office Suites: Microsoft ® Office Home and Student 2007 - Factory Installed!
IncludesWord, Excel, Powerpoint and One Note
Cost: $ 5099

What do you think? Can the same team of a company cheaper? I do not know much about computers, I just want something, what used to freeze when I play. Thank you.