The ones I was looking at were SAS.
What does the final 'S' stand for?

It's still a bit enterprise-y.
I get so used to swapping seamlessly between SAS and SATA drives on the poweredges that it's easy to forget they're actually different systems. It's only when I come to take one the SAS drives and try it in a desktop machine do I remember!
There are a few SAS cards that can be had for less than £100, if you're spending over a grand on a drive and tapes, I'd say you could stretch to a SAS card, hardly a deal breaker.