First, I look at the premium positions:
Quarterback
Drafted Pickett in the first round, no need.
Wide Receiver
Quentin Johnson, Jordan Addison.
Johnson is the best prospect, but will likely be gone. Addison is a lean build and doesn't have blazing speed, but is the best route runner in the draft and obviously was Pickett's favorite target at Pitt.
Left Tackle
Peter Skoronski, Paris Johnson, Broderick Jones.
Skoronski is the top prospect, but may lack the desired length which could push him down. Still, a ton of high-level experience at the position. Johnson looks the part and appeared to have a terrific game against Georgia. Jones had a good season at Georgia and has one more game to showcase himself.
EDGE
Not an immediate need, but maybe one of the deepest positions in the draft. I don't think the Steelers go this direction in the first, but may consider grabbing a pass rusher if one falls to the second.
Cornerback
Kelee Ringo, Joey Porter Jr., Christian Gonzalez, Cam Smith
Ringo has the athletic skillset, but has been inconsistent. Porter will garner a lot of attention because of his dad. Great season and performed very well this season. Gonzalez has terrific size and speed, put up big numbers after transferring to Oregon. Smith doesn't have the same physical attributes, but has been a standout for South Carolina.
Other positions:
RB - no need in the first.
TE - no need in the first.
IOL - no 1st-round worthy prospects
IDL - Bryan Bresee could fall, but I'd prefer Siaki Ika in the 2nd or Andrew Billings (UFA).
LB - Trenton Simpson, but I'd prefer not to go this direction in the first.
S - Brian Branch, Antonio Johnson - Branch just feels like he's going to be a good football player. Johnson seems to have the size that he could play the LB/S hybrid role.