well it depends. will you be using the g keys and LCD? b/c they are both good keyboards. the only thing that separates them is that the g15 has an LCD and the extra keys. me i like the g15 b/c of that.
Wow, $4.99 for 10, guess there's a reason why you're going to have quite a few back-ups .
On topic, I have a friend who really likes the Z-boards. They are customizable for what game that you are playing at the time. Don't know too much about them, but it's worth a look/see because he absolutely loves his...