get one
I bought a 24" referb yesterday. The referbs are 18% off right now, the upgrade will hardly be worth it. When the new ones come out the discount may go as low at 28% so I could have saved a few hundred dollars by waiting, but this way I get it on Friday. A Refurbished iMac 24-inch 2.4GHz Intel Core 2 Duo 1mb, 320 hard Drive is selling for $1499. Go to critical.com and pick up 4GB of extra RAM for about $100 and you are good to go.
The way I look at is, if you want a really powerful computer you have to buy a Mac Pro anyway. The Penryn new chip set wont make a huge difference to the performance
(1-8%) The new Penryn chip will give you a 16% increase in battery life compared to the Merom, but on a iMac this is not feature. Its not a laptop.
The only realistic way to make a computer faster is to get a lot of RAM or a major architecture system change like a quad processor or a much faster Front side bus (with faster RAM), perhaps a faster hard drive 7200rpm. None of this stuff will be in the new IMac.
Performance for most people is limited to getting data off the harddrive into memory (RAM). You want to spend money on anything that speeds up this operation. More RAM = less trips to the harddrive to get stuff. Faster harddrive = faster loading and writing of temp data. I have always used a PC so I might be missing something as I have no real expierence with a Mac but the principles are the same. (big endian, little endain its just the way you look at it).
I will use it for me and my family. My wife and daughter will probally never see the CPU usage go higher then 10%, reading email and surfing wont tax the computer. I will use it for photoshop, 3d studio max, ripping DVD's, duel booting windows xp and running my windows apps over there, playing warcraft every now and then, streaming music to my logitech squeezebox, blogging, e-mail, watching dvd's, messing around with iLife. I ended up buying a 2.8Ghz, 2GB Ram (which I will upgrade to 4 from critical.com) , 24", 500GB harddrive, wireless keyboard and mouse (just because they look so cool with out wires and my wife will like it more). I am thinking of it as a primary family computer, we still each have our own laptops (I have a IBM x61 tablet). But this is a computer we can leave on in a living area and use whenever we need to google something, or just mess around on. I also want a computer that has nothing to do with work this way this computer is just for my own research and play, leave windows for work (i might not duel boot after all). If it was my primary computer I might want a mac pro with a 30" screen and a quad processor.