I've bought about 75% of my gear through Amazon.com but I've also used B&H and Adorama. Have had only good service from all three. Generally, I just go with who has the lowest price including shipping. If it is close, I tend to buy from Amazon, just because I've bought lots of other stuff from them too.
Gear: 5DII, 40D, 24-105 f4L, 100-400L; 24-70 f2.8L, 70-200 f4 IS L, 17-40 f4 L, 50 f1.4, 550 EX (& a 10D w/ a broken shudder & an Elan IIe that still works)
Lightroom 3, Adobe CS6, a Mac Pro 8 core & Macbook Pro dual core flickr
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