Not worth getting a gameport for the Sidewinders; If your compy doesn't come with one, chances are it won't work even if you get one for it due to MS' retarded design.
(A guy called Grendel on one of the sister sites, descentbb, made a box that converts a Sidewinder into a USB device, but alas I found out too late to buy one
The sticks themselves are awesome - Unlike most other sticks, which use resistance strips and pots, all the Sidewinders use optical sensors so the damned things never wear out!!
I still have one plugged into my SB Live!, but I have to use it in analog mode (So the 8-way hat is only 4-way, and half the buttons don't work
I really wish somebody would start making decent 'sticks again... I'm really not impressed with the ones available these days...