I think I've reached a decision after talking to a lot of people...
...and it's that I want the Scorpion for looks and that bit of rough in the sound dept. I'm sure I'll fetch some flak, but a mate had a Scorpion on his Saab turbo (big power modded) for 8 years and it was sweet, and another mate had them on clios, and e36 bimmer coupe and more, and never had a single complaint - and he's a fussy 'stard too.
I've NO doubt that the Milltek is a good system, and I will not knock it. It's just that many people say it's barely louder than std (I want a bit more than that) and the main thing is that the one peice you see - the pipe - looks pants on the Milltek to my eye.
I'd spend days looking at it and wondering if my local powerflow guy could chop it off and weld on a boxer type letterbox pipe. And that buggers my warranty.
So it looks like Scorpion for me, for good or bad. Thanks to all for their opinions, but I have have that tailpipe, with or without loudness.
Next week it'll be on and I'll let you know what I think.