What model should I use as orchestrator with DS 4.1 ?

I use codex on the 20$ plan and my workflow is to use the free chatgpt Sol 5.6 as orchestrator and to implement with 5.6 luna high or xhigh then it upload it to github so can chatgpt review it and the loop continue ,in that scenario I will replace luna with DS 4.1 but for the orchestrator what current model is good for that rule ?