I'm at mastery rank 5. Currently leveling Oberon and trying to decide what frame to build next.
My level 30 stuff:
2 Warframes- Excalibur, Rhino
3 Primary weapons- Braton, Grakata, MK1-Braton
2 Secondary weapons- Dex Furis, Lex
3 Melee weapons- Cronus, Orthos, Scindo
1 Sentinel weapon- Burst Laser.
My Shade is almost maxed and I have a Carrier as well.