Mike,
Sorry, but I think you are comparing apples to oranges. The equivalent of a R-D1 in the Pentax line of DSLRs would be a *ist D/DS/DL or a K110D: a 6 MPix body with no shake reduction. As for lenses, the Pentax Limited Series are autofocus lenses, you should compare classic RF lenses with manual focus M42 or K lenses. I doubt a 6MP body with a few good Takumar lenses will cost more than an Epson R-D1...
I bought recently an used *ist D with top notch glass: 3.5/17 Tamron, 3.5/24 & 1.4/50 S-M-C Takumar, 1.5/85mm Helios 40-2. This combo covers the range 25.5mm-127.5mm in 35mm equiv. focal length. I got the whole set (body + 4 lenses + M42 adapters) for less than $1000.
Cheers,
Abbazz