I just replaced my old 90deg air grinder with a IR 5102 max..
https://www.ebay.com/itm/Ingersoll-R...8AAMXQfFJRL2l2
its a heck of a die grinder and I REALLY like the push button spindle lock on it,,only need 1 wrench to change bits,
its about double your $75. buts its a quality tool..
IR also has a cheaper line and you can see most of them on ebay, just search (Ingersoll-Rand angle Die Grinder)...
most are under or around your $75 budget and are well worth the price..