2 Dell laptops, which one is better value?

What I'm stuck on is. Inspiron15 is thinner, i5 takes eats less battery, WLED better than LED? and bigger hard drive. But the Studio15 has a i7 and is fatter.

$969 w/o tax
Inspiron 15 Notebook
NEW 2010 Intel® Core™ i5-520M (2.40GHz, 4Threads, turbo boost up to 2.93Ghz, 3M cache)
ATI Mobility Radeon™ HD 5450 - 1GB
500GB, 5400 RPM
4GB Shared Dual Channel DDR3 at 1066MHz
Lithium Ion Battery (9 cell)
15.6" HD WLED
High Definition Audio 2.0
8X CD/DVD Burner (Dual Layer DVD+/-R Drive)
Dell 1397 Wireless-G
Integrated 1.3M Pixel Webcam
Height: 0.79" (20.0mm) front / 1.29" (32.8mm) back

or

$1,074 w/o tax
Studio 15 Notebook
NEW 2010 Intel® Core™ i7-720QM Quad Core Processor 1.6GHz (2.8GHz Turbo Mode, 6MB Cache)
4GB Shared Dual Channel DDR3 at 1066MHz
320GB SATA Hard Drive (7200RPM)
Internal Mobile Broadband not included
2 Year Basic Service Plan
ATI Mobility Radeon™ HD 5470, 1GB
15.6" High Definition (720p) LED Display with TrueLife™ and Camera
Standard Keyboard
85 Whr Lithium Ion Battery (9 cell)
8X Slot Load CD/DVD Burner (Dual Layer DVD+/-R Drive)
Height: 1.0" (25.3mm) front / 1.5" (38.9mm) back

The i7 has more power overall. The question is though, what are you going to be using it for?

2nd one, only cos it has 5470 instead of 5450