128 V 135
I ended up going with the 128 convertible. I was looking for a used car for my commute and I had the opportunity to buy either with almost identical color, package, etc... for very near the same price. It wasn't price for me.
My wife and I went for a test drive and I got to say that the 135 is simply too scary fast. The missus didn't like it at all-- and she was Ok with my other convertible, a Boxster S.
Knowing me, I think I'd step on it hard once and wrap it around a tree.
I'm happy with the 128.