A 4080S will give you somewhere between 40-50% more performance at stock TDP. It's also the most power efficient GPU currently.
When you power limit a 4080S to 230W I would expect you would maybe get around 25-30% more performance vs your current cards. Which IMO isn't enough to justify the $999 price of entry when the 5080 and 5090 are expected at some point in the next 6-9 months.