Respriator Questions

Hello group,
Who here has worked with MEK and other wonderful solvents? Where did
you get your respirator gear from, and what models? The filter ones
available in the chain "hardware" stores have fairly vague
specifications on the labels: usually suitable for aromatics,
solvents, etc. This is not something I wish to leave up to chance.
Do I need to fork over the big bucks on this one and pay for a forced
air system?

Thanks in advance.