Need help connecting new laptop to fastest internet

Well, I read the sticky of the different types of internet connections two computers can have. My main desktop is connected to a cable modem. However, I plan on using my laptop in my room (20 feet away from the cable modem). I was wondering if there was a better and faster internet that can be used instead of wireless, or is wireless internet fast enough. I read about ethernet and how it is most effective when the two computers are near each other since it's just a big cord. Thanks.

EDIT

In addition, I want to play xbox 360 life downstairs, and I do not plan on buying two. Any better way instead of spending money on two wireless routers?

 

The wireless connection is not your bottleneck, the modem to the ISP connection is. Actually, your wireless connections is way much faster than your modem - ISP speed.

a/g: 54Mbps
b: 11Mbps
n: up to 300Mbps.

 

Also, one wireless router will supply a signal to both your laptop and xbox

Wirelessman is correct on the cable speed being the bottleneck

A typical cable speed is 1.5mbps to 6mbps--so even the slowest wireless speed (wireless b, which is not normally sold anymore) exceeds your cable connection.

Note: those are optimal speeds. You will likely see lower speeds than those presented depending on the nature of your network setup (distance, materials in the house, interference)

The only time you would notice a difference in a typical home setting is when printing very large documents or moving files from one PC to another. In this case, a wired connection can be significantly faster (standard wired is 100mbps to 1000mbps).

If you don't move large files around at home, a wireless connection is more than sufficient.