Ah, something I have a lot of. Desert Boots. I've had the following:
USGI Issue (Worn since 1992) - These are the regular ones you've seen for years. They're styled after the original jungle boots, but with an upper in all nylon, and no padded collar. Buy US made ones only. Stay away from Altama if possible...Altamas are fine for just wearing occasionally, but for combat or field use, avoid. Wellco.com sells the updated original style boot, with padded collar and larger box toe. Rosearch Panama Sole. Since these are Direct Molded Sole, you'll need to find a good shoe repair place for resole.
Danner Desert Acadias (Worn since May, 2003) - These I purchased from Texas Tactical Gear, but are carried by other online sellers, including Lightfighter.com. These are heavier boots, with a steel shank and padding, and in a darker color called olive mojave. These are excellent boots, but sizing is iffy. I wear a 11.5 Reg and had to have a 11.5 Wide. Of all the ones I have, they are the most expensive, somewhere below $200 is a good price. Made in the USA. Vibram Sierra outsole. This are capable of being resoled and Danner recommends sending the boots back to them.
Wellco Desert ICV (1st pair April, 2004, 2nd Pair July 2004) - These are good lightweight boots that I purchased directly from Wellco.com They are an improvement over the older issue boots because of the removal of the hard DMS sole and replacement of their "Tuffkushion" sole, which is easier on the feet. These do not have a steel shank in them, and are very light. Color is lighter. The sizing is iffy, so try a 1/2 size up from what you wear first. My first pair were too small, and my second pair was just right. $80-90 is what you see them for online, and can get them at Lightfighter.com and Practicaltactical.com as well. They have components which are assembled in the Dominican Republic. Wellco sole similar to Vibram Sierra. Resoling can be done.
Belleville 790D (December, 2003) - These I just happened to find brand new in my local surplus store, and in my size (11.5 Reg). These are the Goretex lined model, and are very comfortable and waterresistant. I wear these in the cooler months. They are heaver than the Wellco ICV Deserts but lighter than the Danners. They are the lighter desert color. You can order them from Bellville directly via the internet. I think they run about $150 or so. Made in USA. Vibram Sierra outsole. Can be resoled.
Belleville 300D (May, 2003) - These are good boots too. Lightweight. Instead of mostly nylon on the sides, they have more leather. Mine must have been mismarked since they were huge on my feet. I since replaced the insoles with Superfeet Inserts and wear Smartwool Socks and they fit a little loose, but no problems yet. Made in USA. I got mine for $110 or so direct from Belleville. These are also the lighter desert tan color. Vibram Sierra outsole. Can be resoled.
More info than you wanted to know, I'm sure. My boots have replaced all of my regular footwear. Just make sure you get something that fits well, and take care of the leather. I also recommend heavily Superfeet inserts. They're called footbeds because they hold your feet in place better than insoles, preventing the slippage that results in blisters or foot problems.