I hate all the german tanks that arent call ins atm and the mortar halftrack insanely useful so i go g g g g g g g mhf pak pak into tiger spam
He asked for under 1000's Ostheer 1v1 strategies advises, not noob comp stomp 4v4 spams...
BTW, my advise which helped me going closer to 500's are : stop focusing on build orders, and learn to adapt yourself at what the enemy is doing, it will greatly improve your skill.
I totaly agree with Sarantini, except maybe for the second pio that IMHO you can delay after getting some armor, cause either you use it close combat or mining and 2 is a bit too much for micro (i mean in opportunity cost), either you wait to have enough armor to use him for repairs.
The thing is late game with ostheer : either you'll face T34/85 and you'll want to deal with it with T3 as soon as it comes out, or you have the balls to wait for an ASAP Tiger, with T2 only and schreks. I usually go 1 Pz IV and 2 paks, with a fuel depot for the Tiger (don't really know if it's that cost effective though).