Quark Riken AL would probably be a good match for you. GXP and 165mm and pretty competitive pricing.

Thanks, yea that would be great. But just to be clear, with the 130 BCD model, i can use my current chain rings correct?

Thanks again

Edit: just noticed on the the 130 version wont be available till july :(

I would get either a stages rival left arm or a quarq. I've used both and they both work great although the stages read a bit lower for me, they were both very consistent.

I ordered my quarq riken on amazon prime for right around $1k. I had to return it once to the factory which they turned around in two days at no cost.

I've used both dura-ace and super record cranksets and I think sram/gxp is the best crankset format.

Yes, you can use your current rings.

Yes, you could get a Rival Stages left arm on your current set. But that has the double negative of both being cosmetically ugly and less accurate.

I've picked up a Riken in the classifieds for a couple hundred less than the cost of a new Stages.

Which Stages in 165mm?

Stages cost would be higher than the initial sticker price as I think the OP would be looking at a chain set swap.