Wildone,
I'm gonna recommend the Dunham boots, also. I have wide, higher-volume feet and narrow heels; I usually wear EE or EEEE shoes and boots, depending on the brand and model. My current boots are a pair of Dunham 4E that fit wonderfully. My day-shoes are a pair of Merrel day hikers that actually fit very well. These days, Merrel is making some of their models in widths and the last they're using for their shoes (the fake foot they build their shoes around) seems to be wider than many companies' lasts right now.
When trying on boots, the boot shouldn't pinch excessively in any particular spot. If it's too tight in the store, odds are it'll be too tight after you take it home. A bit of info a salesman at REI once gave me was that if a boot was uncomfortable in the store, it wouldn't become any less uncomfortable after buying it. The boot should feel fundamentally good from the start, otherwise, it doesn't fit your foot well. One other thing to do when trying on boots is to kick the toe of a pair of boots into the ground; your toe shouldn't hit the inside of the boot. If it does, the boot is too short. On downhill hikes, your toes will jam into the inside of the boot, eventually bruising and bloodying up your toes, even causing you to lose toenails.
Take your time looking, even though it can be frustrating. I usually try on 20 pairs of shoes or boots before I find one that fits. Even then, I've had to return shoes that felt fine after wearing 'em in the store for 15 minutes, but became torturous after walking around for a couple hours at home. Stores have their own return policies; REI's policy is unconditional satisfaction, which I like. I've also had good luck with the former Gart Sports, as well as Sportsman's Warehouse.
I once bought a pair of Salomon boots that felt great in the store and great at home. I took them out for their maiden hike on a cold, snowy day and discovered a couple hours into the hike that the shoelace buckles' metal wasn't covered with any cloth inside the boots. By the end of the hike, my ankles were on fire. It was a design flaw that Salomon had built into the model. I cleaned 'em up, took them back to the store, and explained the problem. My full purchase price was returned. The point is that you needn't settle for crappy quality or a terrible fit. If you can, shop at REI whose store policy is extremely accommodating. If you can't, still refuse to settle for an inferior product, should something you buy prove to not work out.
Good luck and, again, take your time! Boots are ATV's for your feet

Or, more accurately, they are the all-terrain tires for your ATV body. Should you blow a tire out in the middle of nowhere, you've got a whole new set of problems to deal with
