2012 iMac --- i5 or i7 CPU, 21.5" or 27" screen?

Hi Tom, just to give you something else to consider.  I work all day on a computer as I suppose many do.  But when I selected my system, yes I really wanted the 27" and the extra $ was not a problem.  But I sat in front of it for a while at the store and just used it.  Yes the screen is truly scrumptious!  But I began to think of the amount of movement my eyes had to do to get the whole picture.  It was just too much eye muscle work and for me I thought the 21.5 would be sufficient.  I am glad I did.  The 21.5 was the right choice for me.  But you may be younger and eye strain / fatigue might not be an issue.  They are both beautiful systems and the new iMacs are a real wow!  Go Mac, you won't look back.

Good luck.

Sincerely

--
Gary Leland