Ranked Oberon to level 30, I really enjoyed him. It's nice to play the game a bit differently, healing others and doing more than just kill everything in sight. Rhino bored me, it's too easy mode, iron skin makes you take no damage what so ever for long periods of time and just makes you become complacent. I had a shock when I first used Oberon and had to use cover etc and couldn't just tank the damage...
I'm now onto my 5th warframe, Nekros...got him tonight he's lv 6, been going through the mercury missions teaching my brother the game aswell... Building a Saryn frame too be done in 3 days...
Look out for some of the dark sector wars, some clans are giving huge amounts of battle pay to play for them, I played a game yesterday that was offering 50,000 credits per game to play for them. Now I have upgraded every mod I own as much as I can and still have 200,000 credits spare.
Also does anyone have 'Tranquil Cleave' stance mod for nikanas? I would like to trade for it if anyone does...