In general, I can say that pressure cookers range from 27.99$ to 478.99$. To stay on the safe side, you should aim for a pressure cooker within the range of 100$ to 150$; as for this price, you can...
The best choice of an instant pot for Indian cooking in terms of tasty and possibly mineral-rich is in my opinion GRANITESTONE 2590 12-in-1.
In my honest opinion, the best instant pot for a single man, woman, or student is: Instant Pot Duo Mini 7-in-1 Electric Pressure Cooker
In my honest opinion, the best instant pot for a family of 4 is the Instant Pot 8QT Aura Pro. It has an easy to read display, a good variety of functions and will serve you well for a long time.
Before I get into the nitty-gritty, the best choice that gives you many options in terms of size and usage is 10 quarter big instant pot called Instant Pot Duo Nova Pressure Cooker 7 in 1
So quick and short answer is that the instant pots are worth it. They might not replace all your home cooking tech you have, but they will do their best. There is sauteing, steaming, searing, yogurt...