Well Its really a personal choice. Mag wheels will make your car slower to accelerate and slow down due to the mass being further toward the outside of the wheel. They however will make the car handle better. Is your car lowered? I personally think cars that have mags and aren't lowered look pretty aweful sometimes. What sort of mags are you looking at? The Ea - Ed falcon is the sort of car that can look plain ugly with the wrong sort of mag on it. Don't ask me why. But thats my opinion though.
Also the cost of rubber will go up as well.
Wheels look great, really make your car look something special. Wheels are probably the thing that will affect your cars looks the most. However, are they worth $2000+? I was going to buy a set of wheels which all up would have cost me around $3000 with tyres. While they look great, are they $3000 great? They're not worth the money, unless you really desperately want them. If at the moment you just have hubcaps look at getting a set of Ghia rims and polish them up, they can look sweet, and will only cost you about $100-200 from a wrecker.
Rims are cool, and Laminge is right, they can make the car. I've got 17" Boyd Coddington's on mine and they are the best thing on the car. You see people pulling up next to you at traffic lights checking them out hehe:)
BUT, if your on a budget nothing looks cooler than seeing stockies under the guards of a car that is LOWER than LOW!!! If I didn't spend so much money on the Boyd's, I'd have either polished EA Ghia rims or silver interceptors with 15" G-Grid rubber! This looks tough IMO.
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