My approach is variety. I know myself, I get tired of foods if I have to eat them too often.
Mountain House is the best. It's the brand that every other tries to measure up to. Wise doesn't come close in taste or shelf life. They can claim it, but MH has been around for decades and has proof behind their claims. Go Sports Authority to sample a few, or like Min41 said, amazon has. I like to get my MH foil pouches from REI.com. I'm a lifetime member so I get free shipping after $30 or something. And their prices are fair. The #10 cans are good to get from Amazon though for the free shipping and prices.
Try some other freeze dried brands, too. REI stocks some interesting one!
MRE's ain't the best, BUT I think they are ideal for a Bug Out Bag. If clean water is scarce, you may not be able to cook/rehydrate your freeze dried food.
You can get Thrive Foods out at Be Ready Hawaii now. They aren't cheap, but it's more variety. TRY THE STUFF though! For instance, I got their freeze dried mushrooms because I use them a lot in cooking.. they were pretty gross. Their milk isn't very good either. I prefer the LDS (mormon cannery) milk.
Don't forget your herbs and spices.