Yeah, the Voodoo4 aint exactly the cream of the crop any more. I'm a diehard fan of PowerVR(i have a PVR 1 series card lying around here somewher!) and i would recommend you get a Kyro II. It would work nicely, it scales with cpu speed and since you have a 1.4 i can see it getting some fly scores. I can tell you that with an ancient PIII 600 (100Mhz fsb) you get around 1500 3dmarks on 2001. With faster ram and processor i can see it getting its way up to 3000+.
Now then again if you want to be conservative i suggest the GF2 Pro which now goes for around 100$ on www.pricewatch.com. It's a solid all around preformer.
And as always if you have money to burn (Send me some) get a GF3. Consider the ones from Abit and Elsa, they are great for overclocking. Also a company called OCZ sells its own cards that run above spec (215 mhz Core 515Mhz Ram). Search for the OCZ Titan 3.
It really all depends on your mobo/ram type....
<font color=blue>I for one run Quake 3 on a P133(No MMX)</font color=blue>I have no affiliatioin w/ Intel