I'm traveling to Costa Rica in May and Thailand in December. I need a few shirts, some shorts and maybe a pair of convertible pants -- I'm looking for stuff that dries quickly. Are Ex Officio clothes worth the money?

I stopped by their store in Bellevue, Wash., today and while I like the look, fit and usefullness of the clothes, they are pricey. Like $50-70 for a shirt and $50 for nylon convertible pants. I've found some items cheaper online.

Are there any other brands I should look at? Or will I be fine with the regular cotton shirts and cargo shorts already in my closet?