http://www.pcaviator.com/store/product.php?productid=18815&cat=705&page=1

The CLS DC-10 is at PC Aviator for $19.  I don't have it but am thinking about it.

And if you haven't already, book mark the PC Aviator deal of the day, they give great deals on many good paywares.

This may be a bit late but I have the CLS DC-10 in FSX and I find it works for me fairly well. I've never used the RFP 747-200 so I cannot really compare them. The systems modelled are enough to fly the aircraft reasonably realistically (especially if you use the INS versions).

It doesn't have the complexity of say a PMDG model but it's certainly a good step up from the defaults and helps you learn about managing and flying an old fashioned analog cockpit jet. I believe when it was released it was under the F-lite range.