One if the big features IMHO of the 27" is that it has user upgradable RAM slot. Do yourself a favor and take advantage of that and get the stock 8GB RAM and then add in your own 16GB or 32 kit. I have the stock 8GB installed + a Corsair 16GB kit. Works fantastic and only cost me a bit over $100. MUCH less than what Apple charges for just 16GB and I have a total of 24GB rather than 16.