Modem Question

I currently have a Motorola Sbv5120 with service all hooked up.

Its in downstairs room by the boiler fml. The router is extreme poor signal in my room. And im a gamer and i have a cap card but can not use it due to the poor signal. I was wondering if i were to buy a modem like these http://motorola.links.channelintelligence.com/pages/prices.asp?sSKU=SB5101 which are all motorola modems would i need to pay double what am i pay for sevice. so instead of 20 dollars it would be 40? or no. Could i just hook it up and it works.

Buying a new router is not a question

 

Well the problem lies in the router, not your card. Sorry.

Moved to Tech Support.

 

Upgrade the card and router to Wifi N. Which can reach higher transfer rates and 10x signal than WiFi B.

 

If i were to buy a new modem i could direct connect my gaming recorder and my pc aswell and have the best connection possible... And my modem currently is about an easy 5 walls away plus stairs and more obsticles