Hey Chris, its been a while Bud. The GTI guys run the VWR Springs, they should perform pretty mush the same on the 2.5. The only negative I've read is that they develop a break/crack after a while and have to be replaced.
To be honest since you already have the GTI/TDI springs all you really need is the Hotchkis 27mm rear sway bar, set at the softest setting. Unless you install a 27mm front bar I wouldn't go to a stiffer setting. You will not be disappointed, my Son or I wouldn't consider driving any MK6 Golf/GTI without at least the Hotchkis 27mm rear sway bar, for tracking adding the 27mm front bar is recommended.