I am going to be a first time ever Mac purchaser so just trying to ge an idea. What have they retailed for in past years as far as 22" to 27" (I believe those are the current sizes)? Have prices remained the same on past refreshes? Also for a bigger hard drive how much more are we looking at, I'm hoping get at least 100GB is this included in the base model? Ive read prices have been dropped which is why I'm asking what retail price was when they were released.