what you could do mate, is go into a Computer store e.g : Infinity Computer where i work and ask what is the best mobo for a Pentuim IIII and they will tell you what you should get and then u can put it together yourself
thanks guys for your advice but will the nvida chipset on the mobo work better if u have a nvida video card or does it not matter, b/c i have a radeon 9600
Go peep www.newegg.com that is where you will find a very inexpensive mobo for your chip. It will give you details on whether or not your processor is supported and a wide selection to choose from if your budget is tight.