CashCrate has been around since 2006, they have a good reputation and a reasonable $20 payment minimum. Rewards for individual surveys are low but the number of available surveys is usually high. They also pay members for completing offers, watching videos and shopping. Payments are made via check or direct deposit, with more options (like PayPal) for some members. New members get $1.50 just for signing up.
Referral Program: Between 20% and 30% for referrals plus a $3 bonus when referrals earn their first $10.