What A/F Gauge do you run

Thanks guys. I went with the MTX-l from amazon with an xtra bung/plug and free shiping total was ~$170. I don't think i'm close enough for the narrow band and the ease and reviews of the MTX sold me. Plus, my father wanted to know what to get me for an xmas gift, so I told him he could kick in whatever he wanted towards the cost and wrap it up for me :)