It's a socket A, so, yes, your choices are Athlon, Duron, Athlon XP, and Sempron (socket A), all of which are made by AMD.
Your mobo can only handle up to 333MHz FSB. The 3200+ you are talking about is a 400MHz FSB. The highest 333MHz FSB socket A CPU is the 2800+. Here's one on NewEgg for $125 + $4.99 shipping:
Socket A CPUs are getting hard to find. If you have the money, and are willing/able to overclock, look at the mobile Athlons (if you can find them...).