Well, I agree with the session boys in Rome ;-) If your primary purpose is to play on your own, then stick to whatever is easier. But if you want to play with people, don't be lazy and learn to play across the rows. I find Em very easy to play on a C/G. You should learn the 'proper' way now that you're starting on C/G, and not only in a few years, it will be harder to unlearn what you've learned.
Ideally, you'll learn the same tune in two keys. The most common session key, and then the less common one.
As for Dm, there are tons of tunes that are commonly in Dm in sessions, why not learn them? You can start with "The Broken Pledge", "Sergeant Early's Dream", "Julia Delaney", and many others...
Hi thanks for info and tune suggestion
My problem (with the Rochelle) is that, more than E minor being more difficult than D minor to play, the sound of some of the E minor keys are ugly.... i was asking myself whether this was just a quirk of the Rochelle... and if i upgraded to say a Morse the problem would be solved?