Joysticks are rather personal things.
No, get your mind outta the gutter!
I mean that you can get really comfortable with one and like the feel of it, know instinctively where to position it for ergomonics, instantly have your hands dart to the different buttons, etc.
You go and get a "better" stick and you may spend up to 3 months relearning every movement from scratch.
So, before you get a new one, I'd ask "Are you totally fed up with your old one?" first.
Heh, I like my MS Sidewinder* so much I modified it to have more buttons on the handle!
* = actually Sidewinder 3D Pro Plus, but same lineage