You will not notice much of a difference if at all between the two processors. To be honest you should coose models based on other functionality rather than the processor. Most importantly whether you require DVD burning or not.
According to the specs Civ IV is not compatible with the MacBook. From what I heard the PC version is not compatible with the GMA950 graphics processor either so i'm not too hopeful with the mac version. If you want absolute confirmation you may want to contact Aspyr directly.
All LCDs are known to get dead pixels. Sometimes you are lucky to get none and sometime you aren't. To be honest though the occurance of dead pixels in news screens isn't that high.
As with MacBook problems, with computer models there are problems. Some have more than others but all models from all manufacturers have something wrong with them. Fortunately, and unfortunately, we have the unique ability to talk freely about issue in a single place. Yes it does seems that certain problems are more widespread than they really are. Just remember, if you were to observe a hospital in the same way you'd think the entire popluation were sick or injured.
Basically if you feel comfortable with the model that is available today buy it. There will ALWAYS be a new model around the corner. It just comes down to how many corners you want to go around. Keep in mind that the longer you wait the longer you're without that shiny new MacBook… mmmmm … shiny!! 😉