hello....i have 18" RS6 replicas on mine which came with reasonable tyres (not had any complaints about them at all) about £650 all in fitted. that was last november?? so you can prob get replicas packages cheaper now. U can fit 19" on mark 4s without any further mods i believe, depends what look u want to go for. If u on a budget suspension wise u just want a set of springs, Eibach are very good, 35mm-40mm drop prob paying about £150 for the parts.