My concern with Sam picking Sasha is that I feel she may have made the decision from the first meeting. After she met Sash she actually said "now we're talking" and got all girly maybe indicating that she hadn't found any of the other guys all that attractive.
There's definitely a physical connection there but I'm not too sure yet how they connect on other levels. The fact that Sam actually brought up that she was feeling insecure that she's not as wealthy as Sasha was really weird I thought. I feel that if she really knew him she'd already have an idea whether that kind of stuff mattered to him or not.
On the other hand though I'm not sure I see any deep connection with Michael either. I'm one of the few here who don't dislike him, but there's defiently something off between him and Sam I find. It all seems very surface level.
I guess I'm just not really feeling either of the connections. The only one I could really see Sam compatible with on more than the initial attraction level was Richie. They seemed very on the same wave length, maturity level, humour, etc.