For £70 odd, just get the 4 R8 ones
http://www.awesomegti.com/car/vw/golfmk5/red-ignition-coil-pack-set-2-0tfsi
yes over 200 in stock hereWouldnt say they are an upgrade, other than the colour :)
Compared to a 1.8T one yes, but not other 2.0T coils