I would suggest getting samples of alot of different chips.
Don't limit yourself to just paulson chips. Get samples of nextgen and chipco chips as well.
Paulson and chipco chips are used in most casinos in vegas. nextgen chips are very popular for people who want to put custom labels on their chips.
Paulson are probably the best clay chip that you can get. They are expensive though.
Check out
http://www.homepokertourney.com/chips_review.htm for chip reviews on most every chips that is available.
Check out
http://www.5stardeal.com/
and
http://www.holdempokerchips.com/
for a very large selection of both real clay chips and ceramic chips as well.
I have purchased chips from buypokerchips.com before and I have not had any problem with them. I also have purchased chips from the two above mentioned sites as well and not had any problem either.
I dont have any association with the above mentioned sites.
Best advise. Get samples.