I would go for the S60 T5 Sport edition (with the styling kit) it looks more sporty than S60 R and the price is much cheaper with almost the same performance. 2WD vehicle als consume less fuel than 4WD vehicles.

Anyway, if you go for the S60 R, you must know that the automatic gearbox gives you very little fun for that money, it has reduced tourque to a level even the low pressure turbo can match. The reason is that if engine have all the power without any reduction in tourque, the automatic gearbox will get broken very quickly, it is not built for high performace engines like used in R.

If you want to have all the power, then go for the manual transmission, 6 gears, but your hand has to work with the dipstick all the time.
The reduction in tourque is only at lower speeds you can still use the automatic gearbox to overtake some other cars at the highway without problems!

My recommendations above is only if you intend to drive the S60 R as if it was a racing car. Normal driving conditions requires no high performance take offs and the automatic gearbox may be good enough, but just be aware of it before you buy it so you dont get disapointed when you get the car from dealer....
However S60 R is extremely nice interior with soft leather all over.... Its a prestige car impressing all your neightbors!