Please forgive this long winded post. I bought my 2011 iMac in may of 2011 and it has basically been left turned on all these years and is still running great. It is a base model, so has the 500GB HDD. I did upgrade the RAM to 16GB. Now I am at the point where storage is an issue, kind of. I have 4 external HDDs. My iTunes library is like 130GB of music, and I moved that to an external drive since my photography library is now approaching 400GB. Which now is becoming a problem since I have less than 25Gb free, and my photo files are over a GB each! The Mac has a single TB1 port and a FW800 port which is becoming an issue. 2 of my external drives are FW800 and I use the Seagate Slim that has USB3 (which is useless to me sadly) for my iTunes. Externals with FW800 are becoming impossible to find in stores, although they can be found online. $$$$ Yesterday I bought a 3TB 3.5" drive to upgrade my LaCie d2 Quadra that I bought in 2008. To my dismay, it only reads 802.7GB - and is a known problem as the firmware from the enclosure won't acknowledge more than this. LaCie confirms this. Sadly I ordered a 1TB version of this drive on eBay yesterday since it has FW800. I am thinking of buying a used Time Capsule on eBay and upgrading the HDD just to be able to utilize the FW ports. Any advice or experience is greatly appreciated! I really don't want to buy a new iMac (I do, but this one is still running great), but I guess i could get the internal HDD replaced and swap out the optical drive with another drive and that would solve some issues..