The A 60 rim definitely isn't cheap but your getting what you pay for in durability.
Excel Rim A60 Front Rim
I recently bought these for my KX along with RAD MFG. spokes and green nipples. These wheels look incredible and are the strongest I have ever used. I wasn't sure about the silver stripe around the rim at first but after I built the wheels and put the tires on I'm glad I got the A60's over the regular Excels.
Dirt Bike: 1-888-676-8853
[OEM link: http://www.motosport.com/dirtbike/oem-parts/KTM/2012/990-Adventure-R/front-wheel?sku=6000907010030 ]