I find the khumo 712's a VERY good tire that are quite cheap ($150 a tyre i believe).
If you want performace, go the Bridgestone RE540 R-comps, i've got those on my car and they are AMAZING (get ready for a 60kph+ tyre whine tho) :)
trade price for the R-comps are $260 per tyre... not sure on retail - can't be much more (oh and dont expect much more than 15,000kms