I am setting up a workshop in the unfinished area of my basement. I need to run a couple of electrical outlets and would like to run them along the block walls through grey PVC. Will this be a problem or should I use metal conduit instead? There's one circuit already installed by a previous owner, but I'll be removing it. He has 12/2 romex draped from the bottom of the joists running into metal conduit (one per outlet) which ends about 18" below the joists. Not only does it look bad, the romex drapes from counduit to conduit, entering each conduit with no protection from the sharp edge of the pipe. The electric panel is in the same area as the workshop.
You should have no problem using Schedule 80 PVC conduit. It's easy to work with, and you can get pre-formed 90's for any corners (so you won't need a pipe bender).
You might be able to get away with Schedule 40, but since it will be exposed (and in a work area where it could get smashed with a wayward piece of lumber) I would go with Schedule 80.
Just make sure you do a better job than the previous "electrician", and use proper PVC conduit straps to attach the conduit to the wall / ceiling.
KeithS brings up a fair point. Make sure the first receptacle on the line is a GFCI receptacle, then feed the rest of the receptacles from the load side of the GFCI.
Check your local building codes. If code requires metal conduit, then you need to use metal conduit. If code allows plastic conduit, then you can use plastic conduit.
On metal vs plastic: What happens if you drop a hammer on it while you are working? I would err on the side of better crush resistance.