I used to own a Canon 5D MII for the longest time, and upgraded to the 5D MIII recently. You won't be disappointed, it's a beautiful machine.

• When I'm low on space, I usually travel with one lens, the Canon 24-105mm f/4.0 L IS USM kit lens. It's a great all-around lens with a satisfying focal range, nice build quality, L glass, and it's stabilized. The only downside is that it's a f/4.0, therefore it doesn't perform that well hand-held in low-light (say at night, at concerts, bars or venues). You can get it around $1100 new I think, $800 used.

• If I have a bit more space, I also carry the Canon 50mm f/1.4 USM to solve the aforementioned low-light problem. I love ambient light and I try not to rely on a flash. The 50mm f/1.4 is a good prime lens, small, and very "fast" (in terms of aperture). At about $350, it's a great value. It eats light, letting you pretty much shoot in the dark. It's also small and reasonably light, not a bad choice if you are into street photography. It's not an L quality lens, her sister the f/1.2 is, but that's 4 times the price, ouch.

I'll mention my other 2 lenses.

• The Canon 70-200mm f/2.8 L IS USM is hands down my favorite lens as far as image quality is concerned. It's also the most expensive ($1700 back then), the longest, and the heaviest. The bokeh on this lens is wonderful. It's great for action/sports lens, really fast (f/2.8), and features two stabilization modes. It is built like a tank and weights as much. Many people ditch the 24-105mm f/4.0 kit lens and buy both the 24-70mm f/2.8 L and the 70-200mm f/2.8 L IS to cover a nice 24mm to 200mm range at f/2.8.

• The Canon EF 16-35mm f/2.8L II USM is a good wide-angle lens, L glass, I use it primarily to explore abandoned buildings where light isn't always available, capture tight spaces or large structures. Not a cheap lens either ($1500).

As I mentioned above, I don't use flash very often, but I own a Canon Speedlite 580EX II and used to own a Canon Speedlite 430EX II. I would recommend the latter, unless you really need the extra features in the 580EX.