I am also looking to buy a new set –up . Been looking at the (EPL2,NEX5,)GH2 & D7000.
D7000 + 10-17mm+60mm; Cost=$2539, Weight= 1559 g
GH2 + Lumix 8mm fisheye + Lumix 45 mm macro; Cost=$3070 , Weight= 784 g
Guessing the Nauticam housing for the GH2 will be similar to the canon 550 as they are similar dimensions, Cost=$2500 Weight=2500 g
Nauticam D7000 housing, Cost=$3200 Weight =2600 g
Underwater set up excluding ports/strobes/arms that will be similar for both systems.
GH2 = $5570, 3.3 Kgs
D7000=$5740, 4.1 Kgs
Unfortunately the Panasonic lens are very expensive(ebay prices), the fisheye($1080) & macro($940) are more expensive than their Nikon & Tok counterparts.
The lumix 7-14 mm wide angle is even more expensive than the fisheye.
Panasonic system will be 1-2 Kgs lighter than the Nikon. No real difference in price.
GH2 much better for video & liveview, D7000 likely to be better for stills???
The GH2 movie samples on the Panasonic website are really fantastic.
I will be looking forward to see the Nauticam GH2,EPL2 & Nex7??? housings.
If the GF2 had similar specs to the GH2, the smaller GF2 would be perfect & i would definately buy one.