Hello! I am in desperate need of a new computer. I use photoshop cs4 A LOT along with excel, word, internet. I also play games a lot on it. I frequently have multiple things open at one time (for example, i have about 7 internet tabs open right now along with two excel files, photoshop, and word). I want a 21.5 inch imac and I am wondering if the i7 upgrade is worth it? does the hyperthreading cause overheating in the computer? (I feel like I read somewhere that was an issue) Would it be worth it to upgrade to fusion drive as well? I have read somewhere that it is hard to fix things if something goes wrong with the fusion drive (yes, i'll be purchasing the applecare but i prefer to think beyond the length of that as well! ) I also want to get the 16gb of ram as i know its very hard, possibly not doable at all, to add or switch ram later in the 21.5 inch. Thanks in advance!