What systemic chemotherapy do you prefer with concurrent radiation therapy in the neoadjuvant setting for early stage rectal cancer?

In this setting, I always prefer capecitabine for the sake of patient convenience. If there is a reason I can't use it (e.g. renal insufficiency, poor compliance with oral medications), I opt for infusional 5-FU. I would only consider bolus 5-FU if the patient experienced coronary vasospasm with cap...