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We get our current parachutes from Giant Leap Rocketry. We have used both Spherachutes and Tac-1's. Since 2006 we've been using the Tac-1 'chutes because there is virtually no chance of the suspension lines getting tangled. They are heavier than a Spherachute, but don't require the use of a shroud ring. They also come with D-rings on the top and bottom, which makes it easy to attach to the payload string. The quoted descent rates seem fairly accurate (we own the whole range of sizes and pick the appropriate one based on the payload weight being flown). 

On Giant Leap Rocketry's and Spherachute's order pages they each give you the information that you need to select your parachute size.  Just remember it's suggested by the FAA that you have alternating conspicuous colors.  Even though solid bright orange is visible they look just like orange cones on the ground from a long ways away.