Mark,
Val is right, offsets are so important. I would go 9.5 / 10.5 but not with Rays offsets personally. These will be +22 all round and on standard ride hieght will stick out the arch about 1.4 inch. Depends whether you like that look.
I went 9 / 10.5 with a +25 and +29. These are perfect, but you won't get these offsets from Rays.
IMHO 9 / 10's are best. They are lighter and fill the arches nicely. The only wheel I know which comes in this is the PIAA Super Rozza. Very similar design to Val's Work wheels. They are +25 front and back so the rears are pretty close to my Work +29 in terms of how they fill the arch.
I've got loads of pictures of Rays, so there's a particular wheel you like I may have a picture I can post.
So I've stil not voted. Too many variables..