Also, I should mention that one of the Apple Genius people in Sydney told me that I can use the iMac as a monitor - so I was planning to use the HDMI adapter to connect my PS3 to the iMac when I need to watch blu rays on there (or even play games on it).
That won't work on a new iMac, Target display mode is now a thundebolt only input, you will not be able to feed a source from a none thunderbolt device, (even with an adaptor)
Wow, that killed my buzz. Oh well, still not a deal breaker for me - I was thinking of using an external monitor connected to the iMac as well - will just use that as a monitor for my ps3 should I need it.
My main point for getting an iMac is the simple and clean feel of it; wireless keyboard and mouse, built in wifi, just one cable into the power socket (for times when I don't have another monitor at least). Enough power to do basic tasks and some advanced things - my MBP cannot cope well with image processing.
Initially I was going with a MacMini because it essentially has all that, but the 27 inch screen just took me by surprise and that is one of the things that I was sold on.
The nearest competitor to the iMac I believe is Dell XPS 27. Which is pretty much the same price for similar specs - can be picked up for about 200 less than iMac when on specials. But I think the iMac is a much better design. Also, I found that I needed to format my Windows machines every year because they kept getting slow. With Mac, I find that this is not as frequent.
One of the things I really liked is the fusion drive - but I am disappointed that users cannot upgrade that themselves - I would put a 256gb SSD in there before you can spell SSD. But oh well, you cant have everything.