If I were in your shoes, I'd replace them all with nice brick facade retaining walls to go with the house. Then add a lot of mulch around the trees as Spruce suggested. The trees will have fair chances to survive.
Thanks for the suggestion...Not sure if I will go this route though. I think the pine tree is definitely going to get axed. The rest I will try my best to keep. My ultimate goal is to grow some grass. Not much of a landscape bed fan, and I think the brick retaining walls would be a little out of the budget.