Which campground in Custer State Park?

[High5Alive]

We want to camp at Custer State Park?  Does anyone have a suggestion on which campground and site would be best.  I am looking for Electricity and thought about trying to get along the creek.  Any opinions about this would be appreciated.  They start taking reservation on Jan. 2 so I am hoping to be ready to try and get a good site.  Thanks for the help.