I went into bridgestone yesterday for a quote on RE003s. At the moment you can pickup a full set fitted for $783 (225/45/R18). Definitely worth considering as they are a fair bit cheaper than the pilot sports yet are a similar "performance" oriented tyre.
Specifically on the mk5/6 golf and Tiguan platform, RE003 don't even come close to the PS4.
It's like comparing a honda to VW. Both do the same/job/function. One just does it much better.
Ride quality is better, mileage so far has been amazing on my PS4's. low noise level comparative, especially on coarse road seal.
Wet weather handling is where it truly out performs. Bridgestones are great within first 2000-4000kms. But there after they fall truly flat in wet weather. Same as G-Grid, G-Grid II, RE001, RE002 and RE050's did in previous generation tyres.
If you do decide on PS4? As someone else mentioned, Call Chris @ Tyretech advise him I recommended you to him, his pricing on PS4's are pretty phenomenal.