Base 27" at the very minimum. The i5 in the 27" will generally be faster than the i7 in the high end 21.5".
Buy your RAM from a 3rd party. Mucho cheap compared to Apple, for the same stuff.
Or get the high end 27" i7 and get the 2GB VRAM, and add an SSD at a later date, one that will most likely be faster than the one Apple provides.
How do you figure the i5 in the 27 is faster than the 21.5 core i7.
The 21.5 will be almost twice as fast as the i5. Actually there is very little difference between the i7 3.4 and the i7. 2.8. They are the same processor, the i7 2600s has a lower base clock, but the same turbo speed of 3.8 Ghz. Other than that very little difference.
Other than the K version. The i7 2600 is the fastest quad core processor currently in production. The i7 2600S is the second fastest quad core processor currently on the market. Take a look at these benchmarks. Real world bench marks.
http://www.tomshardware.com/charts/.../3DMark-Vantage-Overall-Performance,2416.html
http://www.tomshardware.com/charts/...=on&prod[4792]=on&prod[4790]=on&prod[4793]=on
I ordered the 21.5 core i7 2.8 with SSD + 1TB HD. Montary issues were not my motivation at all.
Other than the better GPU and extra thunderbolt port, there is very little difference performance wise between the 27 i7 3.4 and the 21.5 i7 2.8. Contrary to what others are telling you.
Remember you cannot upgrade the processor. You will be stuck with the i5 for the life of the computer.
I am going to give another aspect or point of view so to speak. I have a 21.5 currently, and have on order a 21.5 with 2.8 i7 and SSD + 1 tb hd.
I use the 21.5 with a 27 cinema display. The Cinema display is superior in every respect than the imac 27. Less warm and no yellow hue to speak of. I own quite a few 27's and the majority of them have some type of yellowing issue.
How many threads on here with people with the same problem?
With using the 21.5 with another display and using the 21.5 as the extra display that is no longer a issue.
Plus you are free to use any display you want, new OLED? New PLS?
You have more options. With the 27 you can do the same, but is that even practical? More than likely you will use the 27 as your main display.
Your stuck with the 27 for the life of the iMac. With he 21.5 with a Cinema display, you get two good glossy IPS panels that match as opposed to a 27 paired with a inferior display.
Thet are the same display, but In my opinion it is superior. I own quite a few 27's and the cinema display is colder, has has more accurate colors due to it being less warm. The whites are accurate with no yellow hue to speak of.
Why the difference I don't know, it is probably due to the iMac being a all in one and the extra heat. The all in form factor has to have a effect than a display without one.
There are a few pics on the forum comparing the two.
You also take advantage of the newest technologies such as PLS and OLED. Both which superior to IPS displays. Here is a samsung PLS screen which should cheaper than IPS screens.
http://www.youtube.com/watch?v=IkHRGVnDXwA