Hunter, once you know how to properly deadlift, a 1.5 x bodyweight deadlift, assuming you are are a healthy, adult male without health or exercise restrictions, will feel more or less like picking up a bag of groceries. If it doesn't, you need to learn how to deadlift.
At the SFL (StrongFirst barbell instructor certification), the requirement is a single with 2 x bodyweight, and Pavel made it clear to us that the standards were to be thought of as meaning you weren't weak, not that you were actually strong. I paraphrase but you get the idea, I hope.
All other things being equal, try deadlifting either conventional or narrow sumo and follow a single, proven program until it no longer yields progress for you, cycling the weights as you go. Expect this to take anywhere from a few months to perhaps a year or two.
As but one person's example, I keep 1.5 x bodyweight on my deadlift bar, never less, and that is where I start all my cycles, start my warmups, etc. Nothing less than that accomplishes anything for me, and I actually find my form gets worse, not better, if I deadlift any less than 1.5 x bodyweight.
-S-