What will be the correct bundle of links if you are getting two tier links? I mean throwing these two links will get anybody suspicious. Then what to do with them?
You can get only these two links. Its not that much trust me. People sometime buy them in bulk.
But still since you are being cautious I would suggest throw 4 second tier links or a bunch of good web 2.0 sites (who have some authority).
I am guessing you meant to write tier 1 links. So, yeah Frank is right. A get couple of just next tier's links with them and you will do just fine.