The Summit GTX ($200) are nice boots, and you should get many years of use out of them.
Vasque Summit GTX Backpacking Boots

These days, lots of boots like the Summit are pretty comfortable right out of the box. But to break them in carefully, I suggest you start by wearing them while watching TV or something for a few hours. Then go for some walks around the neighborhood. Then try a day hike. If all seems in order, then you聮re good to go for a backpacking trip.
The key to ensuring long life for boots is to keep them fairly clean. Grit can abrade the stitching, so if they get grubby, wash them off with some warm water and a soft brush, and then let them air dry. Give the insides an occasional rinse as well聴sweat is acidic and can damage the linings.
There are a number of good products to use on the leather. I like Paste Wax ($8) because it聮s easy to use and is safe for boots with waterproof inner linings. A spray-on version also is $8, but I don聮t think it holds up as well. 聮s G-Wax for smooth leather is similar to Nikwax and works well.
And, that amazing product Sno-Seal (developed in the 1930s and without question the longest-running item in the product lineup) works great. It聮s a natural beeswax material that won聮t soften leather. It does darken it some, however.
That聮s about it. I really don聮t believe you need to invest a lot in cleaners, conditioners, and the like. A hand brush, some wax waterproofing agent (no oil!), and you聮re all set.
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