Opinions on Angel tattoos?

Hey, I'm currently planning on getting a full sleeve tattoo of angels and demons on my left arm. The angels and demons are going to be a gothic styled and the back ground looks a lot like volcanic rocks with cracks. Each demon will have dates or a single word that has meaning to me. Each angel will have a family members name on their arms, but the biggest angel on my bicep will be the only girl and will have my girlfriend and mom's birthday on her arm. Tell me what you think. Also this Is a very detailed tattoo, I'm expecting to pay $3,500 is this accurate sounding?