Well nokia first introduced their first tablet in 2005 and even before that they have been researching this field quite a while. They also have great experience with thier mobile phones. What i am saying is that it took nokia lots of hard work for nokia to get such a device at such a low price with great battery life. Intel has come into the ultraportable category only recently and i expect them to take a while before they settle down and i am sure they will not be sub 500$ devices in the near future.
So if you want to wait more and pay more then its your call.