[quote name='freshzen']Alright I need to setup my 360 wireless now and I am trying to avoid paying $88 bucks for the new official one on Amazon. Was reading something about updating firmware on a 2nd router, sounded complicated and I'm worried I won't get it to work, and end up buying the official adapter anyway.[/QUOTE]
The WRT-DD upgrade is not difficult but it can be problematic and will depend on your existing main AP how easy it will be to get going. It is definately not plug and play.
I did the following. I purchased two TrendNET routers that support WDS. This basically allows you to do bridging. You can usually find this for $80 or less. I placed one in my living room and because it has four ports, I have my XBox 360, HTPC (Win7 Media Center), Samsung TV and Blue-ray Disk player (BD Live) all hooked up to that. They are now able to use wireless N to my second TrendNET router which sits in my office.
Besides plugging everything in, it took all of 30min to hookup and get all my devices working. If I need even more ports, I can just add a switch to my first router and I am all set.
If you only need wireless for the XBox 360, the least problematic and least expensive way is to get things going is the Microsoft G Adapter if all you want access to XBox Live. If you also want to stream video from say a Media Center PC to your XBox, wireless N has a H-U-G-E perfromance difference.
If you need multiple devices to connect, the trendNET routers are cheaper than getting multiple specific adapters.