Dry Hair….Help!

Ladies, I think you know what I'm talking about here..the straw-like, dry hair.

Summer-time is the worst (except on a fall humid day) for hair.  Maybe the chlorine or the sun.  Finding a good hair product for dry hair is hard.  Is it really worth buying the expensive stuff.  I just can't seem to find that one good one.  The cheaper brands seem to make my hair almost lifeless.  Have you ever tried "Wen" hair products.  I've tried this once and it seemed to really work.  Do you use this?  It's rather pricey but if it works, should I buy that?  Maybe it's better than spending so much on products that just don't seem to work.

Have you found a leave-in conditioner that works?  What hair products do you use?  HELP!