I just sold my road bike due to not enjoying riding it. I have been wanting to build a air9 rdo niner to ride on the road or trails. I already have a jet9 rdo. I'm looking for advice in which frame to go with that resembles something similar to the air9.Plan to run a ridged fork. 12x142mm and a pf30. I already have a few parts that will swap over from the jet9. I ride a medium so any suggestions on size would be appreciated too.