I'm looking at buying a new imac, I'm going to wait till the 16th for announcement but either way I'm curious how a thunderbolt connected external Harddrive compares vs a standard internally connected drive, like the one that comes in a imac? I would think that the thunderbolt external would be faster than the stock HDD that come in the iMacs. the reason I ask is because I want to buy the SSD Drive option but anything bigger than the smallest size is rediculouslyl priced. So I would buy the smallest SSD and since I need space to store my photos I thought I would buy a multi terabyte external thunderbolt device. Or would the fusion drive be a better choice for what I need? Thoughts? Thanks for any advice in advance