I was thinking that too. I've seen the 9000 (non pro) for around 70 bucks and I have no idea where a Ti4200 came into that.
Here is another reccomendtaion - Geforce2 GTS-V - best 50 bucks I have ever spent (and that was a long time ago, you might find it cheaper now). Its a slightly slower Geforce2, but you can oc it back up par.
But it really depends how you want to approach this. Do you want a mobo with upgradability? If so, then I would reccomend a Nforce2.
But if you just want whatever right now and don't care for upgradeability you have opened up two options (and neither involve Tbred bs 😉 . Newegg and other sites jacked up the b price to rake in the cash)
a) You get a mobo that supports your old Ram (a few people mentioned the ECS K7S5a) and a 1700+ (49.99)...and as for the videocard you could spend anywhere from 40-80 dollars
b) You could get a mobo that will take in only DDR ram and potentially onboard video (ala nforce1 Asus for 71.99) with the 1700+ again.
In A you don't have to buy new ram, in B you don't have to buy a videocard. Regardless going option two there isn't much further you could go even now with the limit on the FSB (though many kt333s will accept the 333mhz chips like the Epox 8k5a2+)
If you go 1, you will have a LOT of upgradbility but it will come at a price. By going the nforce2 route you are plunking around 140 dollars on a Mobo, another 60-130 dollars on pc2700 ram (256 for 60 and 512 for 130), again 49.99 for the 1700+, and then 50-80 dollars again on a videocard. But this would bascially entail a new computer on its own because once you get these parts you will wonder and ask yourself "why should i stick a ATA33 harddrive on this when I can get a WD 8 meg cahce 80gig for 110..." and then realize you need a new case.
By the way, don't older boards have problems with the new cores? Now that i think of it I hesitate to reccomend that ECS because its one of the older boards out there
EDIT:
As for the Radeon9000- don't bother with it. The cost isn't justified especially when you compare it to the pro- you might as well get that.