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ChainBreaker-
Modifications to boost bass and balance the top end if you find them a bit harsh. These include swapping out the ear pads, punching holes in the membrane on the back of the driver, altering the grills on the back of the enclosure, sticking blu-tack on the magnet (!), then on to more involved stuff like changing the cable and replacing the plastic cups for wooden ones. Most of it is easy and reversible so you can tune them to your preference.
https://www.headphonesty.com/2018/02/introduction-grado-modifications-ear-cups-driver/
Stevethecoffee
I've pulled the trigger on an AudioQuest Dragonfly Red and a mint pair of Grado SR125i on Ebay. Went down the rabbit hole of Grado mods on head-fi forums so I'm looking forward to a little project.