I have both in my collection, at multiple write speeds. I've also used multiple third party CF cards and never really had an issue, though it WILL be one of them that fucks me. Lexar and SanDisk are the Coke and Pepsi of CF cards.
Just make sure you get one with an appropriate write speed (if you aren't shooting sports or 20 frames a second, no need to spend the extra on the Extreme III or 80X cards), and if you haven't yet, buy at least one with free file recovery software.
