Thinking about a mono pod for shooting motocross. I currently have a Slik tripod which has quick release. If possible I would like to get something that also has the same type of release. Looking to spend under $200 complete. Right now i'm using a D90 with a Sigma 70-200mm f2.8, but may upgrade to a D300 in the future. I only mention that because I see that alot of the spec's on the monopods give a max supporting weight. Any suggestions?