None?.

The 2015 class will be very small. There are only 11 Seniors, so figuring a couple others will drop out of the program, the number of recruits in this class will probably b in the range of 13. Thus, we can start with the assumption that it will end up being a bottom-ranked class, since quantity is as important as quality to the recruiting services. That doesn't matter, though. The key is to get the right players with the few spaces available. The small class size probably also means few, if any, JUCOs in the class.

Accepting that, and looking at the depth chart, virtually all positions have excellent depth and numbers already. The only position that stands out as a need position is DT, where 3 of the 10 Seniors are found (Crutcher, McLeod, and Davis), and where 2 more are Juniors (Tautuaiki, Purdum).

Thus, as far as I'm concerned, I'd like to see a couple interior defensive linemen in this class. Beyond that, the remainder of the class should be the best available athletes, regardless of position. A QB and RB are always nice to have, but neither are essential. The same can be said for WR, DE, TE, LB, and DB's. None are really essential, so they need to get the best players available.

Here's my math. After you drop the Seniors out, I compute for 2015:
QB - 4, plus a walkon, want 4-5
RB - 4, plus 2 walkons, want 4-6
WR - 11 plus 7 walkons, want 8-16
TE - 5 plus 2 walkons, want 4-6
OL - 15 plus 6 walkons, want 14-18
P - 2, want 1
LS - 0, need 1, have 1

DT - 4, want 6-8 (need 2)
DE - 6 plus 2 walkons, want 6-8
MLB - 3 plus a walkon, want 3-5
OLB - 6 and 6 walkons, want 5-8
CB - 8 plus 2 walkons, want 5-10
S - 6 plus 4 walkons, want 5-8
PK - 1 plus 2 walkons, want 1

Note - only about 20 of these walkons can be invited to fall camp, so once the fall camp list comes out, we'll have a better idea of which ones will be serious contenders for playing time.

Given the need at DT, the key offers are to:
Elijah Taylor, Moeller (4 stars, has offers from Michigan State, Ohio State, Notre Dame, Tennessee, etc)
Nico Lautanen, Mentor (has offers from Toledo, Akron)
Adam Holtorf, Seward, Nebraska (has offers from Harvard, Yale, Kansas State, NDSU, SDSU, Liberty)
Davon Hamilton, Pickerington Central

Edited this to reflect that Mile Chapman will be a Senior this year, not a Junior, and thus that a long snapper (who has already been recruited) was in fact needed, and that there are 11 Seniors, not 10.

Give me a couple big, mean DTs, a stud MLB, a bulldozer RB, and some nasty interior OL, and I think I will be happy with the class. Throw in some pure ATH to see what we can turn them into just for fun.