nice start man, looks real clean. mod to your style and likes. look around find what you like and dont like.. and if may add the rims look like 16's to me but i could be wrong.
i think in that pic^^ the 16's look the best. especially if you decide to lower your car, with 16's it will be able to go lower without rubbing issues, also generally tires are cheaper for a 15 or 16 instead of a 17.
Yeah, I noticed the cost difference right away. Just didnt realize how big 17s really are. I think the 16s fill out nicer than the 15s. The 15s do look more proportioned though.