Yes, ones that fit you! I would never buy hiking boots online, must go try them on, walk in them lots. The REI flagship store in Denver has a great "faux mountain" area with inclines, rocky parts and steps to try them out on.

The most important thing fitwise: stand on an incline like you're going downhill. Your toes should NOT touch the front of the boot. At all. If they do, you'll be in serious pain after a short amount of time. You want to make sure the laces and fit of the boot are such that they keep your heel in its place without your foot sliding forward and squishing your toes on the downhill.

Waterproof (for me) is a must. All of the trails here have streams running across them well into July. Come to think of it Pooks, are you the one who comes to Estes Park every summer? If so, I really recommend getting the water proof. Then you don't have to worry about balancing on rocks to get over small streams that don't have bridges. You just trudge on through, no worries.

My husband and I both love Lowa, here are mine:
http://www.rei.com/product/733458

They are expensive, I used my 20% coupon to get my last pair. My first pair lasted 4 years and about 500 miles (450 hiking, + 50 snowshoeing). My second pair has not seen as much use since I discovered cycling last year . . .

One last thing, I swear by layering socks. A nice thin silk liner sock topped with a smartwool hiking sock. This way any rubbing is between the socks, not between your foot and the sock. I've never had a blister with this method. DH always got blisters until I finally convinced him to layer, and not a blister since.

Happy Trails!