We bought a pretty reasonable Bimini for our small powerboat from OVERTON'S (
www.Overtons.com). We bought their "Sharkskin" polyester top which for your 25 would cost in the neighborhood of $180.00-250.00 plus shipping (frame comes unassembled, saving on shipping). The frame is aluminum and pretty basic, 3-bows, nylon fittings, stainless screws. We've had it now for 2 seasons and it is standing up well. The top that I mention above is 5'6" long and 42" high. They have higher and lower frames (32", 36", 46", 52", and 48") but the 42" height gives us more than sitting headroom above a seat that is about 8" or so below the deck level of the hinges. They also sell tops made from Sunbrella, adds about $10-15 for the 42" high tops, but the Sharkskin has worked fine for us. The cloth seems to be about the weight of the cloth in typical sails, maybe slightly heavier and it provides enough shade for us (we have the sharkskin blue color). All straps and fittings are included, as is a storage boot and installation took my Dad about 1 hour or less. The frame is stable enough that we can stand aft of the bimini and rest an arm on it while steering in calm water (tiller-steered outboard).
Not fancy, but not at all "cheap" looking despite the price!