new portable laptop specs. any suggestions plzz??

HP Pavilion dv4t series - $644.99

Espresso Black
Genuine Windows Vista Home Premium with Service Pack 1 (64-bit)
Intel(R) Core™2 Duo Processor T6400 (2.0GHz, 2MB L2 Cache, 800MHz FSB)
4GB DDR2 System Memory (2 Dimm) from 1GB DDR2 System Memory (1 Dimm)
320GB 5400RPM SATA Hard Drive with HP ProtectSmart Hard Drive Protection
Intel(R) Graphics Media Accelerator 4500MHD
14.1" diagonal WXGA High-Definition HP BrightView Widescreen Display (1280 x 800)
LightScribe SuperMulti 8X DVD+/-RW with Double Layer Support
Webcam Only
Wireless-G Card
HP Color Matching Keyboard
6 Cell Lithium Ion Battery
Microsoft(R) Works 9.0

few questions–
32 or 64 bit is good??
the above mentioned processor is good or not??
320 or 500 gb harddrive is good??
hp brightview display or hp infinity brightview or hp led brightview is good??
the above mentioned dvd is rewritable or not??
6 Cell Lithium Ion Battery or High Capacity 6 Cell Lithium Ion Battery is good??

any suggestions plzz??