Types of chemotherapy for colon cancer

I have recurrent colon cancer which has metasticized to one of my lungs twice and has been removed twice. I have to repeat chemotherapy but this time it will include oxaliplatin and avastin  every two weeks for six months. Then a period of time with just avastin and xeloda as a maintenance dose. My feeling is that this is kind of like hitting it with a shotgun approach. Does anyone out there have knowledge or experience with Xeloda as the only drug used for chemotherapy for colon cancer?