BeeJay Anya.
Altho he is not guaranteed NBA success.
Here are two other previous huge wingspanners. John Riek is kinda Manute Bol-ish, currently at Mississippi State but does not see much action.
Other guy Saer Sene sniffed some NBA action for bits of three seasons but never stuck, now in Euro.
http://rivals.yahoo.com/highschool/blog/prep_rally/post/Top-junior-hoops-prospect-may-have-longest-wings?urn=highschool-wp2931In fact, according to that aforementioned database, only two players have ever been within an inch of Anya's prodigious spread: 2008 prospect John Riek, measuring at 7-feet-8.75 and 2006 draftee Saer Sene, who is listed at 7-feet-8.5.