Thanks for clarifying! Both you and Tech9 have been extremely helpful and I really appreciate it . I would be extremely happy if I was able to achieve 600 Mbps from the node noting other environmental factors.The recommended list of routers in Post 10 (note: all are AX routers) will be able to push even 2 stream AC clients to their maximum throughput and lowest latency levels.
No AC class router today can touch them. Even if both AC and AX class routers may not be able to give you full 1Gbps ISP paid for speeds in any specific wireless environment.