38-48 Spectres (6 min respawn, best done in Feerott as its quietest and they all single pull)
20-49 Paineel guards (factioning in the Warrens might be required if not necro/enchanter who can charm a guard for a key to the city, no faction hits)
47-53 Felwithe guards (on a 20ish min respawn), I always preferred the ones at the back of Felwithe outside the casters guild. Would get your necro to 53 easily. Bind at Steamfont druid rings, gate to sell, run back, bank around the wall in Felwithe.
47-53 Highkeep nobles/bards (6 min respawn, vendor at Tarn Visilin, FD bank)
Other considerations....
Seafuries 50ish (OOT), Kelethin guards 47-53 (the wanderer outside the rogue guild not a bad place to start), Pyzjn(?) + check Hadden (no exp), inner Kaladim guards, Neriak FQ guards (not easy to break), Spirocs in TD.
Mostly cash camps with a bit of XP attached. If you want good XP with a bit of cash, I'd group instead
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