Im going off memory here so I could be mistaken, but I seem to remember reading somewhere about Snow Leopard DVDs not being able to install directly to certain SSDs. I think it was something like the required drivers didnt get added until 10.6.7 or thereabouts. So you can clone an existing Snow Leopard 10.6.8 installation to an SSD and itll work fine, but you cant install directly from the DVD to the SSD.
Again, I could be mistaken, but it might be worth looking into.