I know many VX owners have use the R1 rotors with much success. I'm sure that they will chime in here.
I went with SP Performance drilled and slotted rotors with stock Isuzu pads. I don't remember why I went with SP rotors (just to be different?), but they have worked well for the past four or five years. I went with the stock Isuzu pads because they tend to last a LOOOOOONG time and create very little dust.
I know drilled and slotted rotors are useless on my VX because I'm never going to rally the truck and push the brakes hard enough, but dang they look cool.
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless