Would help if we knew what kind of rap music you into.....
I'd suggest the new Roots album, Rising Down. If you like the old school stuff get you any Public enemy or BDP album made before 91. If you like that southern shit, you can never go wrong with Outkast. Maybe some T.I. People like Lil Wayne, but I just don't see it. Sounds like shit Andre3000 wrote for him or didn't want. But to each his own.
You better off asking people what they listening to and making a list off of that.