Production shops seem to prefer Lennox blades (advertised mainly in the industrial venues). The Timberwolf are very sharp out-of-the-box, but the angles they sharpen the blades at cause them to dull quicker.
I think the Lennox bi-metal blade is the minimum you would want for edge durability and you may want to consider some of the more specialized options.
Look up woodcraftbands on the internet. Give them a call. Be prepared a strong appalachian accent, but the guy will do a good job of consulting with you on what blade will best suit your needs. The info on the link CaptJim posted are good guidelines on the features you should look for in a blade for cutting bowl blanks. They buy blade stock and cut and weld the blades in their shop. I have never seen a poor weld come from their shop (however they will replace a blade if the weld were to fail).
In the end, we turners abuse blades. Between the dense, exotic woods, thicknesses, and cutting through the bark; our blades see much more wear and tear than standard flatwork would involve.
Disclaimer: I have no affiliation with Woodcraftbands other than being pleased with their service and expertise. The comments about Timberwolf blades dulling quicker is hearsay, but I feel it was told to me by an honest person with deep experience.
Last, here is a link to Russ Fairfield's info on selecting blades for turning:
http://www.woodturnerruss.com/Bandsaw-Using.html
(scroll down for the discussion on blades though you will probably have your attention diverted along the way
)
Good luck.
