I look at Detroit's draft this year, they got a bunch of good players, but awful value. RB, ILB, TE, S with their first four picks are arguably the four least valuable positions in the NFL outside of specialists.
Khan and Weidl nailed it this year drafting premium positions and since I saw center mentioned earlier, I do think historically the Steelers value this position more than other teams...historically, not sure about now.
Top picks need to be QB, OT (particularly LT), EDGE, IDL, CB, and to some extent WR (which is always deeper and talent falls). You assume QB, LT, EDGE, and WR are set for next year. If I had to bet right now, the Steelers would go IDL or CB in the first. Benton looks like he could be very good, but with Heyward a year older, another piece would be huge. They flat out need another starting CB as well.
I think as long as Weidl is in town you'll see investment in the OL often as well as EDGE. You can never have enough depth at either position.