Be real carefull. Yes you will increase the track - I think it is about 25mm each side. I ended up changing my wheels to stop scrapping.
I would strongly suggest setting up the new brakes and then getting the rims. (it alos opens up a whole new world of rims)
This will give you a problem at the back. Drop me a line and I could possibly help you out with some hub extenders at the back - see previous posts about wheel spacers - or I can put you onto a place that makes them.