I think the ".mobi is weak" thing is overrated. I'm not selling it anyways. Iv'e developed it into a video site. It can still go to the top easily with the .mobi extention and strong backlinks.
For example, GuitarLessons.net has only around 150 backlinks and it is on the top of the 2nd page for "guitar lessons". That couldn't be strong backlinks alone. It must also be due to the domain name.
Beauty is in the eye of the beholder and that goes with domain names. Enough people see it and get used to it and they'll like the name.