actually the V3 3500 is also clocked higher then the V3 3000 from 166/166mhz to 183/183mhz.
but no the Rage won't be any faster then your current card (it's not even as fast as a V3 2000) the Rage FuryPro on the other hand is slightly faster then a V3 2000, maybe as fast as a V3 3000(maybe)
as for DOS support what game are you playing that requires something better then a V3 3500?
the only cards that are significantly faster then the V3 3500 are:
Voodoo 4/5 series
but that's about it
cel 566@900, Kyro and SDRAM GOOD. P3 1gig, GTS 64meg/V5 6k and RDRAM BAD.
people that drive slow are easy to pass, it's people who drive fast that provide a challange.