I generally just buy shells. Exactly the type of pants that is in the description of yours. Mesh liners and that's it. Insulated pants are fine, but when the weather warms up, they can be a little too toasty. With these you can layer up. Get yourself some expedition weight thermals if you are worried about being too cold. Microfleece pants work great too, and you can wear a thermal layer under them easy enough. Powerstretch is another nice and warm base layer you could use. In short, I don't think you are going to have a problem.