i've never drove the Edition 30 or the R, but just considering the basics like cost, running costs, comfort and that sort of thing, personally I'd keep the Edition 30. Actually I almost bought second hand Edition 30, the only thing that put me off was it was 3 door instead of 5 door and i really wanted 5.
I think the R is just too expensive for what it is. coupled with the increased running costs and insurance, i couldn't justify the costs to myself. i suppose 4WD on the R would be useful during the winter, but that alone would not make me consider it
the end of the day though, it's your dough, if you fancy the R, fair play to ya, just go for it.