I bought a pair of Bates Tactical 8" lace up with side zippers that I bought from Dicks' Sporting Goods. Great for riding and walking. They are almost as light as running shoes and are leather and canvas for warmer riding weather.
My lower legs and ankles swell every once in a while and I've been wearing these lace up Corcoran boots with a zipper. They are easy to put on and take off without having to unlace. They can be worn as tightly as you want to.
Picked up a similar pair of boots a couple of years ago.
Dakota police and paramedic boots.
Really like the zipper. Easy off and on and waterproof.
Bought some HD Boots on sale... and another pair from Leather Up http://www.leatherup.com/ . Both work well. I prefer to try boots on however as I find big diffeerences even in the same line. For longer rides in cooler Temps and wet weather I use Rocky Boots with Gore Tex (Breathable Waterproof) and Thinsulate Insulation (usually 800 Grams).
Since my old Addison Shoe Company flight boots have all worn out, and the USAF can't get any more since the company went out of business, I've switched over to Red Wing boots. They're the only ones that match the my old flight boots for quality and comfort.