Have to agree with nivek, Gore-tex is pointless for the vast majority of riders - even 20/20 is more than most people need. E]
I disagree with this, last year my wife bought some non goretex pants, maybe in the realm of burton poacher. These were only workable in cold dry conditions. First warm damp day and the pants were heavy and soaked. Goretex bought, problem solved. Even intermediate riders in the east will still have days where they will benefit. Plus I think you benefit on all days due to the breathability.
If you are still growing or really hard on your stuff and budget is an issue there are reasons to spend less but for her she will get years of use from a goretex outfit.