I think I'm gonna go with a GENK31, and wire in a relay so the map lights act as auto door lights as well. Apparently, the GENK31 is identical to the GENK30 except for the wire harnesses they come with. GENK31 has a simpler harness that only has the following functions: map lights, auto dim mirror, temp, and compass, while the GENK30, I think basically adds a relay to the GENK31 harness with the accompanying wiring which includes one more pin the harness/connector for the GENK30 with the auto door feature, and one less pin for the GENK31. And there's about a $50 price difference between the two, essentially for the relay, a pin in the harness, and a little more wire.
My only concern is, where I can find that extra pin for the connector. By any chance does anyone know an online source for the pins that would fit into the harness that comes with this standardized harness for many rear view mirrors? I'm sure this is a pretty generic pin, but I think I remember reading that someone had a source for these pins. I'll need the extra pin for the harness on the GENK31 to get the auto-door feature to work.
Based on the paths previous aftermarket mirror pioneers have walked and were kind enough to post about, I think I can figure it out. I'm just finding it hard to part with the ~$200 or so for a rear view mirror with all the functions I want (auto-dim, map lights that also act as auto door lights, temp, compass), when the original plan that got me thinking another rear view mirror was about $40 for a junk yard GM mirror that I can either get auto dim and no map lights, or even $80 to hack apart 2 mirrors and siamese parts together. Especially when I'm considering getting WR door sills (~$200) because the cheap ass plastic on the stock ones shrinks when it gets cold, and causes the stainless strip to buckle outwards in the middles in cold Toronto winters, and a wind blocker of some sort for top down weather coming soon.
I'm a headhunter, and have a big fish interviewing next week. If that deal goes through, it takes care of my summer. So I think I may treat myself to the mirror if that works out.