I would get the tyan(out of stock) or ati right now, but if most of them are going to be similar. Just watch what you are getting. They advertise as pro but some of the 256MB cards have np memory ratings on them, as do the ez and lites. If you are planning on ocing then I would stay away from them. But sapphire makes a great card and the power color pro 128MB seems to be a good card.
But it seems that the ati card does very well at ocing.
Example
Oh yeah thanks MonkeyDriveExpress, i forgot that the tyan was using 3.6ns memory. But the core still seems to do fine.