Laptop Selection

I do think a laptop off of ebay but I have no idea what to look for. What brands are best? I also want something that I did not plug in, I also want something with an Internet connection wherever I go. (Is it called wireless?)
Sorry computers with me are totally confused.

Thank you for the help in advance!

Key features and benefits:

17 "widescreen LCD

Presents vivid 1440 x 900 WXGA + resolution

1.8GHz AMD Athlon 64 X2 dual-core mobile processor TK-55

Meets requirements of multitasking and multimedia while saving energy

2 GB of DDR2 system memory

Provides improved performance for today's demanding applications and can be upgraded to 4 GB

Hard Drive 160GB

Offer Document Storage, games, music, photos and videos

SuperMulti DVD + /-RW with Double Layer

Allows you to read and burn DVDs and CDs in 11 different disc formats

802.11 b / g Wireless LAN

Connects to wireless home and office networks or to Wi-Fi hotspots to access the Internet easily

Integrated Webcam, integrated microphone and stereo speakers

You can enjoy video chat and multimedia capabilities

Microsoft Windows Vista Home Premium

Makes your computing experience more efficient, safer and more fun
Find out about prices and other options here: http://www.walmart.com/search/browse-ng.do?ic=24_0&ref=125875.183815+500848.4293870348&catNavId=4070

Laptop gather more information. in
just http://www.laptopspecial.blogspot.com