i wouldn't use damsels unless you plan on keeping them...they can be VERY hard to remove once there in, especially with that much lr...
i would skip the angel (tank is to small anyway)...add the eel first (once all levels are at 0) eel are very hardy and will do fine once you cycle is complete...then a month or so later add a dwarf lion...
also, i would suggest throwing like 3 large shrimp (unseasoned) in now to get a good cycle...once all levels are at 0 yyour tank will easily be able to handle the new bioload...
hth,
mike
oh, and what kind of filtration are you running???