Lego 295 pc set
My 8 year old grandson LOVES these kits.  And this one was particularly "cool" because it had a helicopter.  He was able to complete it in about an hour.  And he is very meticulous, takes his time to read the directions and organizes all the pieces.  It's amazing to watch and see him play with them afterwards.  However, I think we will need to add another room onto the house to store all the completed sets.  That is the one down side... haha