Long time GPU miner, first time Asic Miner...  

I moved away from mining eth, given the planned PoS move in June.  Looking to buy an Asic miner, but from what I can tell, the ROI on most miners is 24 months min.  24 months is a lifetime in crypto, as well as the 24 months does not include diff increase over those 24 months.  Am I missing something?  Can anyone give me some suggestions on models that have a decent ROI?  On one hand I can get myself an A 1246 Pro 87T, but i see some new units coming in July at 140T that will certainly raise the hashrate and increase time for ROI.

Thoughts/Guidance ?