Though I believe in using the latest drivers available I'd say that since you're unsure what to download you should use the CD that came with the board. ...but that is an ancient board so you may no longer have the CD.
...back in 2005 I had the SLI Premium. Nice board at the time.
Anyways, your best bet, once again, is just to stick with CD that came with the mobo if you can. ...or you can download all the drivers and start installing. Just do the chipset drivers first, then SATA/RAID, then video, etc.