Thanks for your answer. Yes, at 720 I get a common framerate. But I would prefer to have my footage in 1080, if i could without losses in IQ.
You are right regarding testing out myself and making up my own opinion, and I have done some; to be honest im having trouble spotting the difference between converting my 1080 D7000 footage from 24 to 30, and my 720 D7000 footage from 30 to 24 (Have not received the GoPro yet). There is little or no (to me) visual jiggery juggery going on, after using advanced frame blending (as from Richard Harringtons tutorial).
It would still be interesting to hear what would theoretically be the best way to go for the very best results in cases like this.