Here's been my experience with cams over the last 3 years. I know you dont plan on being at the track all the time, but the numbers will give you an idea of what I was working with. (keep in mind this is an A4)
228/232 110+1
Motor: 11.5
150 shot: 10.72 @128 1.62 60'
Quick, but top end felt weak
MS3 112
Motor: 11.7
150 shot: 10.79 @130 1.58 60'
You can feel it continue to climb on the top end. Fun as hell. Just a little too much lope for me.
233/239 112
Motor: 11.6
125 shot: 10.75 @ 126 1.61 60'
This was my compromise. I really haven't had much of a chance to tweak it track wise but it makes driving to work fun as hell. The car was acting funny so I went with smaller jets at the track. Ended up that I had some electrical problems. Havent had enough free time to test it out since.
As you can see, of the 3 cams the MS3 had more power up top and only lost a small bit of quickness. I think I actually spun a little when the spray hit so I'm sure if I would have given it a chance it would have had the best time. Since I wanted to drive my car more the MS3 was a touch over what I considered to be ok for daily driving. Of the 3 it was the most fun, but sitting in traffic with it was annoying.
Like stated, with your M6 it will be fine. Another thing to keep in mind... since you are getting the cam before the heads you will not get the full effect. Get those higher airflow mods in there as soon as you can and read up to make sure they compliment the cam/each other. I have purchased and sold about 10 cams in the last 6 years so I know how you feel. You read good/bad reviews. Spend hours doing research only to order it and second guess if it was the right choice. You wont know if you like it until you feel it in action. Even driving other peoples cars really doesnt help (imo) because its not your own car. The good news is if you do need to sell it you can make most of your money back.
Sorry for the novel, but you remind me of myself 7 years ago and I figured I could help.