Win 8.1 Dual Function Tablet Laptop 64-bit?

[psxphill]

These don't appear to be terrible

http://shop.lenovo.com/us/en/laptops/lenovo/flex-series/

Although the form factor might not be quite what you were thinking as it doesn't fold flat.

The Yoga 2 13 is a little more expensive (the other Yoga models are a lot more expensive) and might be what you're looking for.

http://shop.lenovo.com/us/en/laptops/lenovo/yoga-laptop-series/

I think you'll struggle to find anything branded for $600 and that makes it unlikely it will last longer than the warranty.

[psxphill]

@danbeaver
how do you want to reach compatibility to win7 application base on 32bit arm device?

The one he listed was a 32bit atom, which is x86.

[psxphill]

@danbeaver
how do you want to reach compatibility to win7 application base on 32bit arm device?

The one he listed was a 32bit atom (Z2760) which runs x86.
But for $600 or less you're looking at arm, unless you find something second hand/on clearance/ebay which is irrelevant to the question.

[psxphill]

There are Intel based tablet/laptops below $600 and plenty of laptops in that range, but you will be looking at non-familiar names on AliExpress or similar. A good tablet paired with a typable keyboard in a fitting cover is the cheapest option, but finding a powerful enough CPU for quick response on a bloated OS is the true problem. C'est la vie!

Ok, you can get an unbranded i3 or Celeron with 2gb of ram for less than $600. I'm not sure I'd want to run 64 bit windows 8.1 on that.

[psxphill]

If you don't run anything graphics intensive the atom was adequate

The cheap atom tablets seem to be 32 bit only and he wanted 64 bit (yes intel do seem to be making 32 bit only cpu's still).

[psxphill]

still i dont know what surface pro 3 is going for.

It depends on the configuration, they go from 64GB+i3, 128GB+i5, 256GB+i5, 256GB+i7 to 512GB+i7. In the UK

http://www.currys.co.uk/gbuk/computing/ipad-tablets-and-ereaders/tablets/microsoft-surface-pro-3-12-tablet-64-gb-10026041-pdt.html?#cat-0

MICROSOFT Surface Pro 3 12" Tablet - 64 GB Intel® Core™ i3 Processor £639.00

or

http://www.johnlewis.com/microsoft-surface-pro-3-intel-core-i7-8gb-ram-windows-8-1-pro-12-512gb-wi-fi-silver/p1655521?sku=233928794&kpid=233928794&s_kenid=256b678c-87dc-7949-d359-00006ed722d5&s_kwcid=402x33637&tmad=c&tmcampid=73&kpid=233928794

Microsoft Surface Pro 3, Intel Core i7, 8GB RAM, Windows 8.1 Pro, 12", 512GB, Wi-Fi, Silver for £1,649.00

If you're a student then Microsoft will sell you one cheaper (£575.10 for the smallest i3). But that is 895 dollars (although Microsoft pricing in dollars is likely to be completely different). It's hard to get Microsoft or google to give you a dollar price outside of the us (or I can't figure out how to....) but amazon have the cheap i3 on sale for $778.78. So it still is way over the budget that he set and it's nearly $200 to go for the i5 (which is the only way to get more than 64gb of storage).
 
http://www.amazon.com/Microsoft-Surface-Pro-Intel-Core/dp/B00KHQWPZA