What exactly do you want to know? The Sandforce controlled drives are the fastest right now. The C300, GSkill Phoenix Pro and OCZ Vertex 2. I recommend 120GB or more if you want to use the drive for Windows, Office and Games. Otherwise you are going to have to be careful with what goes on it so you do not fill it up.
I have a 120GB Vertex 2 with Windows 7 Ultimate x64, Office 2007 and all the games I am playing right now and have about 31GB free.