All good mate.

Yes if you are getting a larger size rim, you will need new tyres to suit.
My advice is to go with something decent, like Bridgestone RE001s... Rather than some cheap Kmart economy tyre.

Your tyres play a big role in how well your car sticks to the road, and I would rather pay a little more for something that could well save my life...

This thread discusses different types of tyre, recommendations etc... http://www.perth-wrx.com/vb/showthre...highlight=tyre