Posted By:
WesleyDon't purchase ungraded cards from dealers that you have not dealt with before unless you have an opportunaity to inspect the cards or the dealers have reputations for being honest or the dealers have acceptable return policies.
If you are buying graded cards, stick with PSA, GAI and SGC. From these three, everyone has different preferences but these three seem to have similar standards and these three seem to be reputable.
When you get a chance, check out the Tips for Collectors link above.