when you are thinking about new rims, think also about how your brakes will look behind them.
Can I suggest you dont go for big 19" open style rims, which may show off how your puny little brakes look. if you want those style of rims it may well be worth considering a big brake kit to complement them, or go for an 18" rim with a bit more spoke so the brakes (or lack of) arent so obvious.
ive seen little hyundais trundling around with big wheels and tiny little drums on the back, so small, you cant even see them