I would move to a very cheap Atom/Sargas core with an integrated GPU/2GB of ram for ~150$ overall. Would have many times any P3's performance.
For that matter, you could get a modern Pentium dual-core and motherboard with integrated graphics for $99, and have enough left over for 2GB of RAM (DDR2-800). That would also beat the dogshit out of anything a P3 could do.http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.519379http://www.newegg.com/Product/Product.aspx?Item=N82E16820227124
To the OP: Basically, Pentium III is a dead end, and this is the point where you have to let it go.