I am half thinking of buying some new camera gear, namely a decent lens (Nikkor 24-70) and perhaps a decent camera (Nikon D700).
Thing is that combination would be twice as heavy as what I have currently, my Nikon D40 and 18-200 lens add up to 1kg, the other combination would add up to 2kg. The D40 and 18-200 don't take the best pictures, but you can be assured of getting passable results in pretty much every situation. The 24-70's focal length would be limited.
Apart from the cost of the D700 + 24-70, I reckon there's a lot to be said for light equipment, then again at one stage the thought of lugging any type of SLR seemed like too much hassle to me.
Then again the end quality of pictures might be worth it, then again how can I justify something like this when it's just a hobby (I don't even take my camera out most weeks). Then again my money is only earning 0.1% in the bank over here at the mo.
There's also the AF-s 50 1.4, and the AF-s 105 2.8 macro out there, they would be even more limited than the 24-70, but I am sure they would be awesome lenses.
I need to stop thinking about buying stuff, and get out there and take more pictures of this wonderful city!
[I suppose there'd be less need for carrying a flash around with me with the D700, the flash is 0.3KG+]