Same kind of dilemma also
Here is my dilemma.
I can't decide!

My decision has been made even more difficult now that I read the initial problems with the 2009 iMac w/4850 graphics is as good as fixed.
My first 'gut feeling' choice was iMac (24", 3.06, Ati 4850 ...) I wouldn't surely need more power than a Dual Core system with 4GB RAM to use iLife and iWork tools..

I do plan on purchasing a decent HD Camera and want to edit my home movies at a decent rate, with iMovie. I also think I may want to purchase Sims 3 - I'm fond of the game and my wife loves it too.
So with those rather scant descriptions of requirements. And not looking at the money side of things. Which

would I be better off with?
Thanks
I have the same kind of dilemma. I was thinking of an iMac 2.93 (base graphics only), then moved on to thinking about an Efix Hackintosh to get more power for the price, and now I have ruled that out (it was just a phase in researching all my options) I think and am weighing up between the 2.93 iMac and the quad core Pro.
My use will be for music with Logic Studio, which does take advantage of all the cores. My last machine has lasted me a ridiculously long time, but I really need to upgrade, so while on one hand the iMac would be a massive step up in it's own right, the Pro would probably keep me going for even longer.
I can buy with UK HE discount, which makes the Pro £1,595.
If I get the iMac I would have to get a couple of external drives for recording & backup, so would save a bit of money by being able to use internal drives on the Pro.
I would have to go cheap on the monitor, but Music will be the sole purpose of the machine, I guess it really comes down to do I really need that lovely iMac display, or would the extra power and longevity of the Pro outweigh the disadvantage of having a budget monitor? I am tending towards the latter at the moment.
While I don't make any money from my music right now, I have made decent money from it in the past and I hope that upgrading my system will help me to get back into that position again, so I guess it's an investment.
This potential purchase represents an awful lot of money to me, so I am spending a lot of time trying to make the right decision.
BTW, I'm really sorry for the thread hijack, maybe I should have posted my own thread, but it seemed my dilemma was not dis-similar.