Any decent HD video cam will do. The big deal is on-set lighting and sound. Get a wireless mic (enough for all the actors, plus a sound board to mix them) and plent of lights or refelectors (cheapo automotive sun shields are great for this).
I know it sounds like it would be more expensive, but you'd be far better off to contact a local video production company. They have all the equipment, lighting, and EXPERIENCE to make a top quality vid. You'll be far better off in the end, and potential clients far more impressed with the result.
Brad