pod_zycie wrote:For your last question, I would like to use ork bikers because I have 9 bike models from the megaforce and i would hate to see them go to waste.
You could always give them to me.
Seriously though, I would highly suggest making a list of what you would think would be the optimal army. Questions about taking "this with that" are mostly tactics forum questions, but people do not mind answering them here either. Make a list, then see what people think about it. If you are committed to fielding the 9 bikers in some form, make sure to include that in your thread.
Just remember that Nob bikers are infinitely better than regular bikers, of which you can see the differences within the Tactics Artikle about Ork Taktiks. Doesn't take too much konvershun to make'em nobz.