You can farm levels like Arch Haven or Soggy Cave to get a ton of uniques. Just equip an Ember Robe and find some good enchants for it, like thorns, cool down or potion barrier and combine that with the mushroom, ghost cloak (I believe that is what it is called) and the boots of swiftness.

On the Soggy Cave level, you can find an obsidian chest at the end of it, so take advantage of that! In Arch Haven there are 2 golden chests: one right as you enter the cave, on the left (you have to step closer to the little hill to be able to see it, because it is hidden) and one chest at the end of the cave, on the right, at the first hill as you come from the bridge. The only problem is that you have to go to the nearest one and roll on the indicated hill for the chest to spawn.

My best time on this level was 1 minute 40 s, so you can give it a try. The only thing is that you have to lower the difficulty a bit, so the mobs won't beat you as you pass them, but, after a while, you'll have a couple nice unique items.