HI have 3 rescues, just added Bogey on Thursday. Rescue is a wonderful thing for you to be thinking about when wanting to add a new member to your family.
Pebbles was the first one I brought home at about 6 months old and we have had her since October 07. She has "issues"

I have the (D)illusion that if we addded a 2nd they would become fast friends. So we began looking and I brought home Doodlebug in June. He was just a baby and is a totale love bug. Pebbles HATED him, she barked and barked in his poor face for about 2 weeks. They are settled in now BUT they are not huddlie with each other, its more like she is the sister with the bratty little brother who just will not stop.
Later week Desmond (now Bogey) was in the rescue section here and I brought him home. Pebbles of course HATES him and will have nothing to do with him

Doodlebug and Bogey are BEST FREIENDS they romp and play and my husband says that they are long lost brothers.
I would like to address the issue of adoption fees with rescues. Yes, they are high and for the most in demand dogs the fees are even higher but only for the reason that for all of the dogs that you see for adoption there are many in foster care that are not adoptable and never will be. So the higher fees help to offset the care of all of the sick and un~adoptable dogs that will spent the rest of their lives in a foster home.
So I look at it like this, not only am I opening my heart and home for a rescue but I am also helping to support all of the other less fortunate dogs that the rescue also supports. It is a very worthwhile cause and my 3 have brought great joy to my entire family!