If you hit up the refurbished section of Newegg, you can pick up the same card for $91 + shipping. Likewise, they have the original Radeon 9500 available for $109. If you get that, you might get one of the infamous L-shaped memory cards that could be soft-modded to a 9700.
That's a list of all the different ATI cards and how they shape up for a soft-mod. Even if you get an I-shaped memory board, the 9500 Pro mod might give you a leg up in performance over a 9600 Pro.