No doubt the R26-R would be a hell of alot of fun, just the normal R26 was an excellent car! However I just don't think I could live with the R26-R everyday like you could with the RS and that's what puts me off... Yeah it's mental, but I also need to do me shopping every week, plus it's nice to occasionally sit in your own back seats, if you know what i mean hehe ;)
If I had to by the Renault though, I'd just go for a 2nd hand F1 R26 in that liquid yellow paint, that still looks awesome and it has back seats!