in my experience, medyo bitin if you only go plus 1 inch on the rims. it's not a huge difference...medyo bitin ang dating. if you go at least plus 2 (so 17" in your case) mas maganda ang effect

of course, it's more expensive, and you have less rubber to guard against bengkong...but if it's looks you're after you can't beat this.
also factor in the cost of lowering springs or new suspension when you put on bigger rims. without lowering your car will look like an SUV with the bigger wheels.
i don't understand the car audio question. kung may aux connection na yung car stereo mo, all you need is the right wire to play your ipod thru the car stereo. or maybe i misunderstood your question
