Having now a good house and very sufficient income, he intended to marry; and in seeking a reconciliation with the Longbourn family he had a wife in view, as he meant to chuse one of the daughters, if he found them as handsome and amiable as they were represented by common report. This was his plan of amends -- of atonement -- for inheriting their father's estate; and he thought it an excellent one, full of eligibility and suitableness, and excessively generous and disinterested on his own part. (Chapter 15)
Mr. Collins extends the olive branch to Mr. Bennet and travels to Herefordshire to select a wife from among his daughters to take home to Lady Catherine as he explains in Chapter 14, “She had even condescended to advise him to marry as soon as he could, provided he chose with discretion…” Mr. Collins says he wishes to heal the breach caused by a quarrel between Mr. Bennet had and his departed father and to make amends to his cousins for the entail which is not actually his fault. Healing the breach and making amends are only a means to an end and not the end project itself. Mr. Collins is much more interested in securing a pretty and amiable wife which is not a horrible goal in itself but I think Mr. Collins is deceptive about his priorities. He wraps up his real goal in peace making and conditioned generosity pretending to make the Bennet cause his cause. ;D
In reality Mr. Collins is drawn to Longbourn not because of the father but because he has heard the Bennet sisters are handsome and amiable. His thoughts in Chapter 15 indicate he will choose one of the Bennet sisters for his bride if they are as handsome and amiable as he heard they were. A second reason the Bennet sisters are prime candidates is that he feels the entail gives him special influence with them. The idea is if he marries one of the Bennet sisters then hopefully Mrs. Bennet and any unmarried daughters will have a home or at least some claim upon him for support—this is exactly what Mrs. Bennet thinks. Mr. Collins believes the entail makes him particularly attractive to the Bennet sisters—that is the full of eligibility part of his plan. His plan however is neither excessively generous nor disinterested on his own part but rather geared to be used to his best advantage. ;D