I'll toss in my 2¢ here. From a commercial perspective folks that cut bare MDF or particle board all day long run either a 40t TCG or if they also want to cut single sided melamine with the same blade without changing it they will run a 60t TCG. Either blade can be purchased in most saw shops for under $60. Bare MDF and Particle board machine well with almost any blade you can put in the saw, it's just that some blades are more economical in the long run.
Scott
Scott's Sharpening Service
Glendale, AZ