Upgrading from Nikon D700o DX to Nikon D800 FX

I"m thinking upon selling my DX kit which include:

1 Nikon D7000 Body Only
2 Nikkor Lens 16 85 mm VR2
3 Nikkor Prime Lens 35 mm VR2
4 Sigma lens 8 16 mm OS
5 MBD 11 Power Grip
6 Extra Battery Enl15
7 SD Card 16 GB Class 10
8 Lowpro sling shot Bag 202
9 Monfroto Tripod

I got a good offer At 90 % of initial cost, and I'm thinking to get the Nikon D800 With the Nikkor Lens 24 70 mm F2.8 i have to pay a difference of USD 950.00

Any advice!