Until I upgraded to the k200D, my previous upgrade had been from the DL to the k100D Super. Frankly, the DL was a nice starter DSLR for me, but the SR alone on the k100D Super was worth the upgrade. If I were you, I'd go for the k100D Super out of those 2. I still have mine as a backup until I decide what to do with it, but I loved using the k100D. I got a great deal on the k200--only reason I upgraded.
As far as price, I presume you are referring to the $300 deal at Onecall? Here's the link.
Pentax K100D Super (Body Only) - Factory Renewed Digital SLR - In Stock at OneCall.com