Smaller motors with reasonable KVs! Thank you!
The 1410/1y sounds like a very good choice! Kv of around 3000-3300 and ~60mm long should fill in the gap left by Medusa. Nice for 3s and even 4s, 4 pole, slotted, etc.
The 1415/1y (2200kv) looks like it will be a good buggy motor for 4s use in places where the current 2650kv motor is a tad high on the kv. Lighter (10.5oz vs 12oz of the 1515) is nice too.