BEST FOR: LOW LIGHT

Since it shoots at "just" 16.2 megapixels, the D4 shouldn't be the king of the DSLRs. But how the D4's features come together make it the gold standard among pros. With unparalleled low-light performance (its maximum ISO is 204,800), this camera gets even the toughest shot. [$6,000 body only, lenses start at $135; shop.nikonusa.com]