The intercooler is hidden anyway so you can buy a solid gold one if you want, no one will see it.
I would go with the S3 cooler.... you can pick them up for about 150 usually.
x2.
That Airtec twin thing is like the Forge Twintercooler isn't it? So it's an additional series of hoses and an additional volume to fill with compressed air, as well as the oem IC for all the air to travel through. If you're in Dubai and doing quarter miles all day while sitting on tickover for ages in between runs and don't mind loads of pressure drop... go for it!
I just can't see how something like that would be beneficial on a k03 daily? Maybe on a 400+ car running 2 bar, but surely you'll lose more response than you gain in power on a k03.
S3 IC replaces the standard IC. Job done really.