I've had two M3s and now a CSL.
Being honest - "real world" difference in terms of A to B on the roads? Nothing really assuming both M3 and CSL have same tyres. On the roads you don't (shouldn't?) be reaching the limits of brakes. The "real world experience" is different though, CSL just sounds more raw which adds to the illusion of speed.
Track? Well, both cars need modifying to make them sustainable on track. I'd argue that if you stripped both cars, same tyres/suspension/brakes then again, going to be fook all in it.
The deciding factor is just working out what you want it for, how much cash you have etc. The CSL is a rare beast on the roads whereas E46 are still very common. If you like the idea of taking good care of a car and having something different, CSL is ace. Although bear in mind that if used as a daily driver you're going to be far more narked if someone dings it in a carpark etc. You also can't get away from the impressive price hike a CSL demands over its equivalent mileage/condition M3.
You mentioned the girlfriend - remember that CSL seats don't adjust and the suspension can seem hard compared to modern armchairs so this may not win any favours.
If you were going to completely strip (ie devalue, or "ruin" to some) a car, do it with an M3. If you want a fast road car that looks the business and is also capable on track, CSL with brakes/suspension will be hard to beat.
Although - I did the Andy Walsh carlimits day yesterday with my brother. On Andy's "circuit" he punted the CSL round in 52 seconds, and my brothers crappy little 1.8 mx5 in 54 seconds. His circuit is essentially doing short blasts between cones and back again, so isn't representative of a track, but is probably similar to blasting between the roundabouts at milton keynes. Makes you think....
Anyhow, sounds like you want a decent ride for the road, either will do that nicely.
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