Wondering if going conservative or all the way, also what brand would you suggest?

 

In my opinion, I'd go with 7-14/15mm if you're going to bother with spacers.

RSS seems to have a good rep on the forums. If you dig a little deeper, there are a few companies that offer hub-centric spacers in all sizes (even 5mm), which may lessen the chance of vibrations at speed. I can dig up the links I found later, but I'm sure others will chime in before I get a chance.

I'm also considering spacers, but I don't think they will look good without a decent drop in ride height on my car (I don't have S-PASM).