Tired of adjusting legs to get the pan level, so it's time for a leveling base. I shoot the gross majority of my tripod mounted activity using long glass and a Wimberly Sidekick in a Markins M20 on a Gitzo 1325. Two options as I see it... 1) Acratech Leveling base.. It's the shorter of the two options, quite a bit lighter but is rated for 25lbs. Cost is around $150 or so. Relies on a twist clamp. 2) Bogen/Manfrotto 3502 Slightly taller, and quite heavier, rated for 33lbs and cost a bit less. Relies on a lever action to adjust and I have read some reviews claiming it is prone to sticking. I've ruled out the Gitzo 1321 because of the hanging center post. Any feedback on either of these.? Any other options?? If anyone uses either , can you tell me the diameter of the top tripod mounting plates?