I need a diesel for the miles, doing about 100 a day and since I live in North Yorkshire, the road's aren't great but I do like the diesel grunt.
Remapped 123D's have such gains and 0-60 times are immense for the car, although the twin turbo does help it
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The 118D 140 is a similar speed to the VW/Audi 2.0 140 engine, probably not much difference with them at the base.
What Porsche's are you all looking at? I've done a 400 mile round trip in a 911 Turbo and that was just next level, amazed by it.
I'd probably still take the S3 over the RS3, i'm not sure why because I love the RS cars. But on the A3 and only in the sportback, I don't think it looks right, although i'm sure its an unreal speed!
megane R26R 
These are under rated.