Here's my take on the remaining candidates:
Selina - awful. Very bitchy, she must be gone soon
Scott - seems confident and generally effective. Bit of a tool last week though blanking Sam after he was fired.
Vana - I think she has potential. I think her future will rest on whether she can get through to the interviews.
Richard - Arrogant but also seems fairly astute. If he can avoid annoying people (in particular Lord Sugar and his aides) then he stands a chance.
David - Not convinced. Seems a bit wishy-washy, surprised he has lasted this long
Joseph - Came to the fore recently, shows good practical application and leadership. I think LS will have a soft spot for him, however I can see him coming unstuck in the interviews and having his business plan scrutinised if he gets that far
Gary - Dark horse. Unlike most candidates, I can't really remember many major failings on his part (there may have been some, but they haven't stuck in the memory). As with Vana I think if he makes it through to interview he has a real chance.
Brett - out of his depth. Nothing against the guy but I just can't picture him as a business partner for LS
Charleine - doesn't strike me as being particularly intelligent, but does seem to make the most of what she has. Haven't really formed an opinion on her yet.