i normally go for the low or mid point, but this time i went w/ the max and got a 64gb sd card. who knows, maybe i'll use the tablet differently knowing that i have the extra space. and it's a cheap upgrade. w/ a full computer, you often have to pay for a lot more to double the memory....like you can get double the memory, but that model also comes w/ a faster processor so the cost of upgrading is a bit. so i went all out and i don't regret it.
Hey, Dude, this was a 3 1/2 year old question. Today, 64GB is the minimum for the Surface 3 and 128GB is currently only $50 more, and you also get twice as much RAM, as well. I recently ordered a 128GB microSD card for only $30, so you can get a Surface 3 with 256GB of combined storage for less than $600.