Wireless Router range issues, Comparing a Linksys WRT610N to a Linksys WRT120N?

I currently own a Linksys WRT120N router, this router is located on the first floor of my house, but apparently, it doesn't reach the 2nd floor. It has a good range but, considering that the only internet connection output is in one room, Do you think the Linksys WRT610N would be a possible solution to my problem? I want a good router, with a good range, and something with the 2 bandwidths which I find awesome. there's no other tv downstairs and I really love playing MW2 on my ps3, and surfing youtube on my laptop in my room.
Please help!
 
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