What is the difference between these Dell Studios (laptops)?

here are the two dell studio 15 laptops. one is 1000 something the second is 800. i think the deal may have changed while i was customizing it but idk. sorry, tried to make format better (took a long time btw) but still not perfect. thanks!!!! no macs or pc's i cant get from best buy please!

PROCESSOR Intel® Core™ 2 Duo P7350 (2.0GHz/1066Mhz FSB/3MB cache)
OPERATING SYSTEM Genuine Windows Vista® Home Premium Edition SP1, 64-Bit
OFFICE SOFTWARE No Microsoft Office
WARRANTY AND SERVICE Classic Protection: 2yr Ltd Warranty, InHome Service after Remote Diagnosis
HD DISPLAY 15.6" High Definition (720p) LED Display with TrueLife™ and Camera
MEMORY 4GB Shared Dual Channel DDR2 at 800MHz
HARD DRIVE Size: 320GB SATA Hard Drive (5400RPM)
VIDEO CARD 256MB ATI Mobility Radeon HD 4570
INTERNAL OPTICAL DRIVE 8X Slot Load Super Multi (DL DVD+/-R Drive + RAM support)
WIRELESS CARDS Intel® WiFi Link 5100 802.11agn Half Mini-Card
BATTERY OPTIONS 85 WHr Lithium Ion Battery (9 cell)
SOUND OPTIONS High Definition Audio 2.0
KEYBOARD Standard Keyboard

(0 cheaper for some reason.. you know why?)
PROCESSOR Intel® Core™ 2 Duo T6600 (2.2GHz/800Mhz FSB/2MB cache)
OPERATING SYSTEM Genuine Windows Vista® Home Premium Edition SP1, 64-Bit
OFFICE SOFTWARE No Microsoft Office
WARRANTY AND SERVICE Classic Protection: 1yr Ltd Warranty, InHome Service after Remote Diagnosis
HD DISPLAY 15.6" High Definition (720p) LED Display with TrueLife™ and Camera
MEMORY 4GB Shared Dual Channel DDR2 at 800MHz
HARD DRIVE Size: 500GB SATA Hard Drive (5400RPM)
VIDEO CARD 256MB ATI Mobility Radeon HD 4570
INTERNAL OPTICAL DRIVE 8X Slot Load Super Multi (DL DVD+/-R Drive + RAM support)
WIRELESS CARDS Intel® WiFi Link 5100 802.11agn Half Mini-Card
BATTERY OPTIONS 85 WHr Lithium Ion Battery (9 cell)
SOUND OPTIONS High Definition Audio 2.0
KEYBOARD Standard Keyboard
haha yeah i was thinnking that too. ill just see if best buy has a plan.
no gaming but maybe some minor photoshopping and stuff like that. im planning on going with the cheaper one. plus it has 500gb
sorry, but whats the 'cache'. and is 1 mb a big deal? thanks
but there's also an upgrade for the second, cheaper one. its a Intel® Core™ 2 Duo P8600 (2.4GHz/1066Mhz FSB/3MB cache) for an extra 5. thats still or so less than the first one. should i upgrade to that? and an increase to 6gb ram would make it more than the first one, which i dont want to do

will 4gb RAM be good for vista home premium 64-bit?
i am planning on taking off a few minor appearance features to make it run faster as well as getting rid of bloatware that comes with it and changing startup programs

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