What vacuum pumps are you using for your laminating and composite work? Do I need to spend $500 to $800 or more on a pump? I would appreciate feedback on ideal pump specs such as size, pressure, volume, etc. from people that have been there done that. I don't want to be replacing or upgrading as I progress. I am currently working on a 54mm min. dia. level 2 project and I am thinking of cutting my teeth on some fin lamination and tip to tip. Thanks. Bryan