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The answer to this question really depends on location and your occupation and your future fiance.
The average varies but you can use $3500 to $4000 as a guage
Just remember that doesn't mean that you have to buy a ring for that price. Many times your budget will not allow for that or you should buy a more expensive one due to your budget.
What really matters is what you think your fiance will like and then see how close you can get to that with your budget.
Bigger diamonds usually garner more attention than more expensive settings but most of the time regardless of the ring, it is the actual relationship that counts.
If she loves you she will love the ring.
If you want a better way to figure out how much to spend, you can take your salary and multiply it by .05 so that will give you 5% and that may be a good price.