Just replaced my el-cheapo S5 style 18" alloys with WSP branded ones (same style) and the difference is day & night...especially wrt being lighter and better finish. Overall the wheels just feel much better quality. WSP wheels are made in Italy and once you put the oem Audi centre caps on, no-one can tell they're replicas They seem to get good reviews and don't cost a small fortune. I bought mine from Vetta7 in Italy but there's a few UK retailers selling them.
WSPItaly Cerchi in lega
Audi - Vetta7.com
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Wsp Italy Alloy Wheels - browse a huge range of alloys and buy online - LK Performance