It depends on how well 당신 know the couple getting married, and how much 당신 can afford. My niece got married last spring, so we were very generous with her. 당신 can see if the couple is registered anywhere; most people do that, and there is usually a range of gift items and prices. 당신 can also go in with a group of 프렌즈 to get a 더 많이 expensive gift. But at the end, it is your budget, and your 프렌즈 do not want 당신 to break your account for a gift.