I think the first question to be answered is...
1) What do you want 1st AF or MF? (of course, M lenses are MF, BUT, the EP-1 has AF available plus longer lenses and zooms)
2) Do you want the availability of longer lenses than 135mm?
3) If you already have a DSLR, The RD-1 may add to your available camera preferences when a DRF may be a benefit for the photo experience.
Personally, I'd go for the EP-1 with an M adapter and 50mm f/1.4 Voigtlander, and maybe a ZD 12-60 , ZD 50-200 lens with 4/3rds>m4/3rds adapter..If I had the money and no other camera, The 50mm becomes a Very Bright 100mm f/1.4...Nice portrait lens and low light lens for some indoor functions.