Back in early 2009 I purchased a 24" iMac with a Core 2 Duo 2.93 GHz, Nvidia GeForce GT120, 4 GB RAM and 1 TB HDD. Over the last couple of years, I have enjoyed the iMac quite a bit and have not had any issues. I use my iMac a lot for photo editing (iPhoto and Aperture 3) and some video editing (iMovie) primarily and have about 200GB left of free space. My question is whether or not the upgrade to an i5 iMac 27" would be worth the extra 800-1000 I would need to spend after selling my old one. Is the speed difference on day to day tasks really noticeable? I do not doubt the new iMacs are great machines, but I do wonder if I am far enough into new generations to really see a difference with the compared to my model or not. Any suggestions are appreciated.