its the dell inspiration 1525

it comes with

My Components
SYSTEM COLOR Flamingo Pink edit
PROCESSOR Intel® Pentium® Dual Core T2390 (1.86GHz/533Mhz FSB/1MB cache) edit
OPERATING SYSTEM Genuine Windows Vista® Home Premium Edition SP1 edit
HD DISPLAY Glossy, widescreen 15.4 inch display (1280×800) edit
MEMORY 2GB Shared Dual Channel DDR2 at 667MHz edit
HARD DRIVE Size: 160GB SATA Hard Drive (5400RPM) edit
VIDEO CARD Intel Graphics Media Accelerator X3100 edit
INTERNAL OPTICAL DRIVE CD / DVD Writer (DVD+/-RW Drive) edit
WIRELESS NETWORK CARDS Dell Wireless 1395 802.11g Mini-Card edit
INTEGRATED WEBCAM No Webcam Option edit
BATTERY OPTIONS 6 cell battery edit
SOUND OPTIONS High Definition Audio 2.0 edit
My Accessories
PRINTER Dell All-In-One V305 Printer edit
SERVICE & SUPPORT 1Yr Ltd. Warranty- Advanced Exchange edit
DELL V305 PRINTER Dell V305 All-In-One Printer edit
ANTIVIRUS SOFTWARE McAfee SecurityCenter with anti-virus, anti-spyware, firewall, 30-Days edit
OFFICE SOFTWARE Microsoft Works edit
My Service
WARRANTY AND SERVICE DellCare Value edit
DATASAFE ONLINE BACKUP DataSafe included with DellCare Service bundle edit
DIAL-UP INTERNET ACCESS Earthlink Internet Access edit
ALSO INCLUDED WITH YOUR SYSTEM
Network Integrated 10/100 Network Card
Modem Integrated Modem
Adobe Software Adobe® Acrobat® Reader 9.0
Labels Windows Vista™ Premium
Processor Branding Intel Pentium® Dual-Core Processor

and about the memory and the hard drive i dont know anything about that stuff so could someone please explain a little and does mine have a good one?
it comes to 5 (but thats after warrenty, getting it in another color, and a printer)
what about if i got one with 3 gb of memory and a 250 gb hard drive??