I think whatever you chose won't work for one reason. Your asking people what to make.

If you make a website because someone told you or suggested the idea to you it won't be near as successful as you won't have as much of an interest as if you came up with the idea yourself and had a genuine real interest. 50% of the initial success of a website is down to the webmaster. If it's your own idea you've have a natural more eager drive and determination which will increase the chances of the sites success and survival.

Your not in any rush. Your better off going away and thinking about it yourself for a while instead of wasting time and effort because someone told you to.