Well, I'll chime in FWIW. I took over Texas Tech in Allen a few seasons back, similar situation (not as many openings, but same conference & prestige). I had been gone a while from HD and looking back I made some mistakes that may end up costing me my job this season... I've never coached Nebraska, but I have coached also Iowa State and Kansas in Crum (under l_eustachy) so I'm pretty familiar with the area and conference. Not knowing what else is around you in Knight (that's a 2 a day world correct?), I'm going to assume you have teams as good or better coached by humans on 3 sides of you (Colorado, Kansas, Iowa State/Iowa). Locals will be tough to get if that is true--if any of these directions has teams listed not filled by humans you may be a bit more aggressive.
I think you will also find that at C+ top recruits (rated say around 10 or higher at position) will take your calls but will probably give you the back-up message, so you'll need to essentially pull them down with evals--anticipate this. That will make it harder and take longer for you to get considered, making it more likely you will have a battle. Even 3-star recruits may give you the back-up message, as I've seen at texas Tech.
My recommendation--with my recent mistakes fresh in mind--is first as always decide what you want your team to be. With 7 open you have many options, but to some extent you must get viable Big 12 players in, even if you don't fill all your ships. If it were me I'd do the scouting and look for kids with 2-stars or less (unless you have some higher ranked kids within 200 miles--a bit further out if you have some neighbors who are not human coached), with great WE and lots of potential. I'd be trying to sign 5, with 2-3 of them being viewed for offense and maybe the others as solid role players. Not every kid needs to be a stud, and if you battle for 5 studs you may get lucky but will probably end up with a bunch of walk-ons. You may want to even emphasize defense and rebounding over all else--go for a slow-down defensive squad and look for scores down the road?
Also, don't be afraid to look at Juco's (I find they are often better than rated).
Cost is hard to gage, as it depends on who wants to battle; given your situation if you find a decent player everyone will probably be willing to battle. I think you'll find $35k is a decent estimate to start; way too high for most but too little for a few.
Hope that is some help.