Trek Lexa SLX or Madone 4.5

It depends on the fit. The Lexa is a women's specific geometry which is typically good for short waisted women. That works well for SOME, not all women. Many women (those with longer legs)are better fitted to a traditional mens bike.

The Madone is a better frame and, truthfully, the bicycle IS the frame. I'd say yes; it's worth the 1/3 more cost of $800. The components are only accessories to that. Buy the best fram you can afford which fits you. Components, color, tires, etc. are all incidentals and far less important.

Thanks! I've test ridden both- both models in the women's specific are a good fit for me.

Great! Now you just need to get riding!

I used to sell Trek and Specialized when I worked at a shop. Hoping you found the bike which is perfect for you. Fit is the most important thing, then frame quality, then everything else. It's a tough lesson to teach sometimes.

$800 is a lot of money, but in this situation I doubt you will ever regret spending it.