Well, for quality, Sony makes some real slick Tapes.
Personally, I buy mine at Sam's Club. They sell an 8-pack of Maxell tapes for $20. Anywhere else, the same exact tapes would cost me $35-40.
The only time I've ever had a problem with a tape was when I bought some super saver generic brand tapes online for something like $1.75 each. It looked like a savings, but it was the biggest waste of cash ever.
Honestly, if you're using virgin stock for your projects, about any tape will do. It's only in recording over existing footage where you can hurt yourself with cheap tape. In my opinion, avoid generic brands, and you'll be okay.