prop time, 18 cc 150 johnson

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so ive got the motor sitting back there looking all shiny and nice, now comes the tricky part; prop time. got a simple 3 blade prop (17" i think) on right now, probably going to have to go bigger. boat has a 48 gal fuel tank and a homemade (from wood=heavy) 40 gallon baitwell so she is on the heavy side. rarely fish w/ more than one other person for longer runs, if shes loaded w/ people we're just booze cruising. i tried searching old threads and didnt find much. motor is a 150 hp carbed johnson. oh and for all you guys much smarter than me that kept drilling the weight to power issue into my head, she tips the scales at 391 lbs. also, any of you SC guys know of a good prop shop in charleston area where i could try them before buying?