Laptop Problems

Does this sound like a good computer. Im finishing up college. I use it to type papers and work on various creative writing, keep my schedule, surf the web, chat, and store itunes music (1500 songs max). I use my old computer a lot, and am constantly multitasking with various tabs open. I like speed and memory for a cheap price (but who doesnt ) I dont use it for gaming.
HP Pavilion Entertainment dv6z customizable Notebook PC
NT633AV
– Espresso Black
– Genuine Windows Vista Home Premium with Service Pack 1 (64-bit)
– AMD Athlon(TM) X2 Dual-Core Processor for Notebook PCs QL-65 (2.1GHz)
– 4GB DDR2 System Memory (2 Dimm)
– FREE Upgrade to 320GB 5400RPM SATA Hard Drive with HP ProtectSmart Hard Drive Protection
– ATI Radeon(TM) HD 3200 Graphics
– 16.0″ diagonal High Definition HP Brightview Display (1366×768)
– LightScribe SuperMulti 8X DVD+/-RW with Double Layer Support
– Webcam Only
– Wireless-G Card
– HP Color Matching Keyboard
– 6 Cell Lithium Ion Battery
– No Modem
– System Recovery DVD with Genuine Windows Vista Home Premium (64-bit)
– $20 OFF! Microsoft(R) Office Home and Student 2007
– HP Home & Home Office Store in-box envelope
(and i got a 2 year warranty)
My main question is do I really need 4GB of RAM to run the 64bit vista, or can i get away with 3GB? Would this slow me down? Thanks