what sam said above. With that many flats I would change everything as flats really ruin the pleasure of riding. Start with stripping off the old rim tape. Check around the valve hole for burrs. Rewrap with a good quality cloth tape. Normally it is OK to ride with cheap tubes but some report much better reliability with a $5-$6 name brand tube. Lastly...a good name brand tire. I too weigh 185 lbs. You need to check your tire pressures every ride or every two days if you want to prevent pinch flats.
Good Luck,
George