A 5 Quart crock pot will only cook about 5-6 lbs at a time. Cutting a couple of pounds up for stew/fajita meat is a good option. Otherwise I'd do the slow oven roasting kitoi recommends. Add water, minimal salt/seasonings, cover tightly with foil, and cook low and slow.
Although, the monotony of eating the same meat for every meal would get to me... just sayin'
42 yo female; 5'8"
Oct 2009: 205 lbs
Dec 2010: 167 lbs
Current weight: 158 lbs (first time under 160 in 17 years!!!)
Goal weight: 145 lbs