Your link should work.  I found others, but your price is pretty good.
I have a PE 2900 with PERC 6i SAS RAID controller. It currently has two 750GB SATAu drives in it, configured RAID1. I'd like to buy two more drives for it, to also configure RAID1.  Preferably 2TB... maybe 1TB if 2TB is still too expensive. Dell doesn't currently have any... and the people I've been talking to there can't explain anything clearly.  I've been able to find compatibility info for the PE 2900 III ... but nowhere does mine indicate a III, so I assume it is not. However, I don't find any info for a plain PE 2900.  What's the difference?  For the 2900 III, it seems it can handle SATA or SATAu or SAS.  However, you shouldn't mix SAS drives with SATA. But is it okay to mix SATA with SATAu?  For the 2900 III, another thread recommended this: [URL] but that lists the 2900 III, not the 2900.  But also lists many other PowerEdge servers.  So, will it work with the 2900?  Or can anyone point me to a source of appropriate compatible drives?  (sigh... this shouldn't be soooo hard)
Adding HotPlug drives to my PE2900? (Different than PE2900 III?)