Multi-entry exit visa is 2300 SAR per person for 12 months. It doesn't matter where you go but you need to have it if you are planning on leaving KSA on the regular.
Swan is right about the maids and drivers. Really depends on how often you need the help. For example, a live in maid is going to cost you ~ $5,000 (USD) to get set up and around $400 / month. Also she is going to live with you. You can get a houseboy around here for around $100/month for around 8 hours a week.