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I just went from OEM RFTs Continental 17's to 18" Michelin Pilot Super Sports. Couldn't be happier with the change. Even though went up to 18s the ride is much better than the old RFTs. Cornering, ride comfort, noise, everything is better with the SSs.
Now with that said, you are asking for economical setup. I might get booed here but I put a set of Hankook Ventus v12s on my Z3 a couple months before I sold it last summer. Those tires were amazing. There were a lot of tremendous reviews on them (Consumer Report, Motor Trend and high numbers from TireRack) and since I didn't want to spend a lot because I was looking for a Z4 I went for them. I was extremely pleased with handling, ride comfort. A little soft on the sidewalls but unless you are really pushing them they are great.
Best part is the cost. Tire Rack has 225/45/17s for $108 plus a $20 rebate. That's $352 after rebate plus maybe $50 shipping and then of course mounting/balance.
So in answer to your best+economical setup my vote is the Hankooks
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