I've tried a few brands of disposables and like the Pigeon disposable breast pads best... it's cheap and good. I go through one box of 60 (usually ~$14) in 4-6 weeks, depending on my supply and how hard my baby is working to help me clear my milk supply.
I had the Avent reusable pads but I find it too small, it moves during sleeping time and I wake up with a wet top. Agree with agaga you need about 6 pairs, machine wash in a bag is fine but I don't like to see the milk stain on the pads.