Wireless Security Alarm

Need recommendation: Which vedio camera has detachable/wireless collar mike recording system? I find unless you are very near; oncamera mike picks up weak audio specially during interviews session. We wish to make a testimonial promotional film of acceptable quality. I have a modest budget to acquire my equipment: camera, tripod, small light umbrella type and mirophone (collar type). Pretty confused. Please advice. I am from Mumbai India and a graphic artist at that. Just recently learn moviemaker in windows xp it is amazingly simple and a great software