I own a 20 inch Imac and Im a graphic designer, which is a bit diffrent than video. I have 2 diffrent computers that I do my graphics work on. My 20 inch imac and a 15.4 inch MBP with a 19 inch widescreen LCD. Both have their ups and downs, although I enjoy using the 20 inch imac better for indesign, and the widescreen moniter for photoshop dont ask me why I just do lol.
Anyways for you it just depends on if you want the extra 4 inches. to me that 4 inches is not worth $500, but that is just me. I have plenty of screen real estate on the 20 inch imac and with proper window managment I dont have to move around windows to look at things in safari and what im working on in photoshop or indesign. I also have Itunes running all the time and I like to skip around songs, as well as talk to people on Ichat, while working on a safari window and indesign or photoshop.
As for the extra video ram, get the most you can afford, video ram is always a good thing to have especialy with video like you said you would be doing. In all of my new computers that I have bought in the past year which have been the MBP, Imac, and a windows box(specialty photography software) I have never gotten less than 256 mb of ram, I guess it just kinda future proofs them, you never know what you might want to do down the line.
Anyways for you it just depends on if you want the extra 4 inches. to me that 4 inches is not worth $500, but that is just me. I have plenty of screen real estate on the 20 inch imac and with proper window managment I dont have to move around windows to look at things in safari and what im working on in photoshop or indesign. I also have Itunes running all the time and I like to skip around songs, as well as talk to people on Ichat, while working on a safari window and indesign or photoshop.
As for the extra video ram, get the most you can afford, video ram is always a good thing to have especialy with video like you said you would be doing. In all of my new computers that I have bought in the past year which have been the MBP, Imac, and a windows box(specialty photography software) I have never gotten less than 256 mb of ram, I guess it just kinda future proofs them, you never know what you might want to do down the line.