I have been looking at the ad's in the Videomaker magazine and see at least 3 remote controls that can be mounted on a tripod. I need advice as to which one is the best to purchase. I have been looking at one from Varizoom, one from signvideo and one from Sudio1Store. I am using a 3221 bogen tripod with a 501 head and Sony camcorder. Please advise.