Hi Graham,
I have the 1514 (i.e. 1510 with dividers) and the 1564 (1560 with dividers).
As Steven (fishfoto) mentions above, once you (literally) squeeze the 400mm into the 1514, there is very little room for anything else... one body, short lens, couple of batteries.
The 1514 is ideal if you're using your 300mm as your long glass. I can get two 1D bodies, 300mm, 70-200mm, wide zoom, spare batteries and flash in there quite comfortably. You can sit on it as well of course.
The 1564 is significantly more sizeable. It will hold the 400mm nicely, plus a couple of bodies, 70-200mm, wide angle, batteries, flash with space for other accessories, e.g. aquatechs. Again, it's a nice seat too. It is, however, pretty heavy so not ideal if you can't roll it for much of the journey from car to pitchside.
If you use a lid organiser in the Peli case, that will give you a bit of extra space for widgets.
Using either case, you'll still have to carry your laptop in a small shoulder bag.
Interesting to note that with the 1564, I can even fit a Gitzo GM2340 monopod in the lid organiser. One less thing to carry.
Very good price on 1564 with lid organiser: http://cgi.ebay.co.uk …6&_trksid=p3286.m14.l1318
The alternative approach that I sometimes use is the Peli 1514 and Lowepro 650AW shoulder bag combo. I pack the 1514 fairly 'light' with 2 bodies, 70-200mm, wide angle, batteries, flash, etc. The 400mm fits nicely in the 650AW along with laptop (I use a 13" MacBook) and aquatechs. I pop my monopod under the (unzipped) lid of the 650AW.
This works well as everything goes in two bags with a good 'balance' - i.e. neither bag is too heavy. You also have the 1514 as a ready-to-go seat.
Hope that helps a bit.
---- Gavin
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