With only 4 slots, I assume that most people will only be buying 16 or 32 gig modules (since it's not a good idea to mix/match 16's/32's with anything lower). If you were to buy 16's and max out at 64 gigs...say in 3-4 years if you wanted to expand on that, you would have to replace all of the 16's for 32's, correct? Wouldn't it make more sense just to buy 1 or 2 32's for future expandability? I've been looking around for 32g modules to get an idea of cost, but haven't found any. Can someone provide any insight and links to them?