Don't get SP4. I've had it since February and it never actually worked as it should. First it had a lot of issues with sleep, display drivers, docking station, crashes etc. They gradually fixed it and by the end of July it worked ALMOST good but then they released the Anniversary Update which broke things again. Now it is impossible to turn it off or restart - it always freezes. The solution is to turn off Fast Boot but then it takes much longer to turn it on. The action center, explorer and in general the whole computer freezes constantly. It has problems with SD cards - freezes, display drivers - external monitors suddenly displaying 640x480 until restart. If you go to Event Viewer you can see A LOT OF ERRORS - drivers not working, all sorts of DistributedCOM errors, push notification problems and, funny enough, event tracing crashing. EVERY SINGLE TIME YOU RESTART your machine.
Oh, and I would forget about very important thing - Facebook videos, YouTube videos or any vidoes pretty much stopped working.
And another surprise - it gets hot. Really hot. I actually bought a fan specifically to cool my SP4 when I work. It just blows cold air directly at the back of the computer and that helps. Without it my Surface actually turned off itself a few times because it was so hot.
And before everything-that's-Microsoft-lovers jump here with advice: yes, I did reinstall the whole windows. Many times since Aug. 2nd. I refreshed, reinstalled from USB, reinstalled from the cloud (there is such an option). Always the same result. I spent $3000 on this computer. $3000. There is really no excuse for this failure of a computer.
So, long story short - if you want to spend $1k-$3k on a computer that doesn't work - go ahead, do it. But if you want to spend the money and enjoy a stable machine I would definitely avoid Surface these days. I would probably go with one of HP. Or, if you're not tied to Windows, then maybe even something from a fruit competitor - after all - they really "just work". Of course they have their own problems but ever since I had SP4 I am very jealous of people everywhere with macs that work in a Starbucks and suddenly just close the cover and go. My goodness - I would never do that with my SP4. I would simply lose my work and get home or work with a VERY VERY HOT computer in my bag with empty battery.