Here are a few few albums as suggestions(the videos are tracks from the albums). None of them are straight up alt-hip hop but are some of my recent favourites.
Pillow Fight – Pillow Fight – 2013
Dan the automator (producer behind dr octagon) and emily wells . Its not hip hop but worth a lisen if your a DrOct/Deltron/Handsome fan.
[video]https://www.youtube.com/watch?v=4ZBwGofFyJE&spfreload=10[/video]
Hodgy Beats – untitled EP – 2012
OFWGKTA MC rapping oever some nice laid back beats with a nice relaxed feel. released as a free download.
[video]https://www.youtube.com/watch?v=4IUkW7NZriM&list=PL2444DA8301E66534&spfreload=10[/video]
Tyler the creator – Goblin – 2011
OFWGKTA MC with a suprisingly deep voice and influences from Dr Octogon/eminem/generic horror core/Neptunes and his own up bringing.
[video]https://www.youtube.com/watch?v=XSbZidsgMfw&spfreload=10[/video]
No Malice – Hear Ye Him – 2013
former member of the Clipse and would probably have previously fallen under your class of gangsta rapper. he has now found christ and his albumms about self-improvement and repenting his past. These couldn’t be any less gangsta if it tried.
[video]https://www.youtube.com/watch?v=RanNgjTeSs0&spfreload=10[/video]
[video]https://www.youtube.com/watch?v=WsXRKlk1V9o&list=UUzGTzkcZKOuwT4QaZ3oBTNQ[/video]
CAS – The number 13 – 2013
London MC playing with a mixture of different imageries in his lyrics. content mainly revolves around street level drug dealing and being a faceless undead deamon.
[video]https://www.youtube.com/watch?v=c8z8u4zAE3s[/video]
[video]https://www.youtube.com/watch?v=CSXIi6i-xzU[/video]
[video]https://www.youtube.com/watch?v=hQ6gbCD2EQA[/video]