CDRs are cheap nowadays, so it doesn't hurt to buy discs of reasonable quality. Anything from Verbatim, Maxell or TDK will be fine, MMore and Philips are also OK if they exist in your area.
For superior quality, the "pastels" that rapid fire mentions are among the very best, and also the Plextor-branded which are about the same discs (premium Taiyo Yuden).