POLL: Is this a good deal for an XBOX 360?

My older sister never plays her xbox 360 4gb with kinect and she is willing to give it to me for 75$ I already have a modern warfare 2 xbox 360 with 250, but I could sell it to amazon for 150$ and then buy one of the 250gb hdd for it and I would actually make 26$ and I would get kinect, the slim, and 4gb of extra space in the process. Would you do it?