Pal, you're the one telling me I'm being cretinous. I'm not trying to be clever, I'm just not doing the guy calling me cretinous and asking for clarification any favors. Apparently, you have some reading comprehension troubles along with a lack of personal skills, but let me put this as simply as I possibly can:
He is WAITING for a Mac Pro 2012 and complaining that he NEEDS IT NOW. Well, its not here NOW. SOOOO, if his 2005 Dell can do the job at all (I made a mistake he does not seem to have 2008 Mac Pro), then certainly so can the 2011 iMac or Mac Mini. Without any explanation from this guy on what he needs, there is a very, very small chance other machines in the Mac line up can not quite adequately do the jobs he needs doing.
Maybe next time, if something isn't clear to you, you hold off on telling someone they are being cretinous until you get it explained to you. There are a lot of possibilities out there when you don't understand something, jumping to the assumption that someone is being cretinous is not going to help you understand what others are saying to you.