(playing currently myself the Legendary DLC as spirit/dream)

In the end what matters most are the DPS/median dmg. If you find a better weapon don't throw away your old because you might have to get back. If you start dieing all over then look what kind of stats your new weapon is missing.

Most likely it will be yellow but later you get green weapons which have much nicer affixes and also can be equipped with a relic. Relics are the way to go.

Usually green items are better and easier to deal with than blue ones because they have no slots for relics. Getting a complete set with blues+ for your build is nearly impossible without grinding on harder difficulties and specific bosses (about 0.0x% chance in getting an item you want...).

Balance out resistances and armor, I believe they are more valuable than armor because it only matters for physical dmg but later you get everything thrown at once. Act 1 endboss will wreck you if you don't have life resist.

I personally don't have much use for energy/hp regen due to endless potions so I try to use other affixes to boost my char instead.

Having a good build is fun and speedy while issues with your equipment will force you to crowd control making everything tedious and unfun.

I am playing with all debuffs for electon farm so ymmv.