1. Definately the Deathclaw Pack, south(east) of the Cliffside Prospector Camp, on the other side of the colorado. There are about eighteen deathclaws, which contain a few babys, 2 mothers, 2 alpha males, and the rest are regular deathclaws. Behind the pack area there are two corpses, one with a bad condition Enclave Remnant Power Armor (No helmet) and one with T-51b armor and helmet with medium condition.
2. Silver Peak Mine. There are dozens of cazadors that are hard to see in the dark, and they are a [censored] to shoot if you don't have a fully-automatic weapon. At the end of the mine there is a gated area, and inside is a corpse with a medium condition Enclave Remnant Power Helmet. You would really have to be a super-badass to survive in both places :toughninja: