You will need to tell us what you got first.
mk4, bora etc are pcd 5x100 et 35 (ish)
Mk5 platform 5x112 et 49 ish...
aspect ratio on 18's about 40, 19's 35
width all depends on the width of the wheels.
Can't go wrong with BBS RC's, CH's, LM's, Callitos etc...
AGU, K03s, TIP, 007p, Pipercross panel, green top injectors, Milltek turbo back, Unichip 2, coilovers, pollybushed, EBC / Blac diamond brakes, Montreal 1's just now, hella magic colours, anni headlights
(http://uk-mkivs.net/forums/t/105553.aspx)
241.3 BHP @ 6473 rpm Engine (215.4 @ 5375 rpm wheels)
280.4 lbft @ 3,453 rpm