Advice on changing from stock 14 inch rims and spacing

http://imgur.com/a/WiEHX
This is a link to imgur that has pics of the duster.


See how much room there is in the back fender? I would like to have that a bit more full

Percy makes a wheel and tire measuring tool. I have one. I highly recommend it. It's like 75 bucks from Summit. With that tool, you can measure your car and see what backspacing, offset and tire you can fit. It works very well.