Best Memory Card Options

I have had my Playstation 2 for almost 5 years now and was wondering what other PS2 users do for memory. I know there is the standard 8MB card, but that isn't enough even when I do delete some of the save files I have from games that I rent. I buy the memory card used and have heard of cards higher than 8MB, but was wondering if anyone thought the investment is worth it?

Thanks!

Well, there is a 64mb memory that I have and work great. It's from Codejunkies

I also buy it with ARMAX disc that allows you to put your save games in a pendrive to save them later in a PC.

PS2 Max Memory 64MB