It depends on how much of that 30K you want to spend and how fast you want to go.
If it was my money and wanted to keep the 26', I would start with a 500 or 525. With that boat a Bravo should handle it. My 26' ft Scarab will do 68GPS with its 502.
My second choice if I had that 30K would be to sell the 26, take the 30K and go to a bigger boat all ready set up.
Just my .02 not 30K worth. good luck