I'm rather the "discreet" type of guy, so I would think the Murcielago attracts too much attention to be a daily driver. Besides, the idea of a daily driver is, in my opinion, to have a vehicle to be used as a vehicle

easy to use, practical and even better if it's a Mr Nobody's car, so you don't have to be too careful when you move here and there. And also, keep in mind that the Murcie is a BIG car

Same goes for the R8 I think.
If I was looking for an up-scale daily driver (which I am, actually), I would go for the DBS (I'm seriously considering a V8 - the DBS is much too expensive for me

).
Hope that helps a bit.
Hey Tom...that is a lovely car you have
