R to X Conversion

There probably a thread with links located somewhere on this forum. I searched for it and got back about 1000 different options. So I thought I would cheat and post a new topic. I am interested in purchasing X rims and tires. I know the easy way to do it would be to visit my local Yamaha dealer and order them. But like most of my life decisions, I make thing more difficult. I am alway searching to save a penny or two. Can anyone provide me with a link or a recommendation for a affordable option in the conversion?
I understand there is some small modifications to the break line and possibly to the break rotor. Any help would be greatly appreciated.

I want to do the same thing, but can't afford x wheels. I'm just going to try street rubber on my r.

Warp 9 wheels seems to be the most popular choice.

if you want to go cheaper, slap some road rubber on the R wheels. won't be exactly the same feel or performance as a true 17", but sure as hell will be cheaper

Thanks for the comments. I would prefer to purchase 17"s. Really dig the supermoto look. I plan on using my wr for community during the week and would like to slap the knobbies on it for my weekend mud runs. I have spent hours searching for a deal on rims/tires combo. I believe the costs will be about $1,200. Anyone find anything cheaper?

You can try and find a used set here. I think I'm going after market x wheels too.