For intricate fretwork I use FDUR #1 and #3 I also have few dozen of the larger sizes. The #5 and #7 cut through the 30mm to 50 mm pine Ok and leave a nice surface.
For the thicker timbers I prefer the Olson PGt blades. They cut quicker than the FDUR and still leave a nice surface, however for a blade that lasts and cuts like a hot knife through butter, I don't believe you could go past the Olson Mach blades. The #7 outlasts the FDUR by heaps and even cuts a lot more than a PGT blade, however the finish is not as smooth.
As for spiral blades, I like the Flying Dutchman New Spirals, they seem easier to control than other brands.
I get my blades from The Wooden Teddy Bear and their gross pricing is pretty good, actually bloody cheap if you compare them to the cost of blades in OZ. They also post quickly and take the time to package the items the least costly way. I also get quite a few other bits and pieces from them at the same time, such as toggle buttons, Clear nylon buffers, picture frame inserts and anything else that catches my eye.