Hey guys,

I am wanting to spend some money on upgrading some of my gear and I was wanting some advice on where to spend it.

Gear
****
Camera: D90
Lenses: 18-55m, 55-200m, 18-200mm, 50mm
Filters: 2x UV filters
Tripod: Cheap $50 one from JBHIFI
Remote: Yongnuo Digital
Bag: Cheap bag that can fit just camera and one lens

Interests
*******
Astrophotography
Landscape
Potraits (Babies, Maternity)

Study
*****
- The teaching company "Fundamentals to Photography" lecture series
- Fundamentals to Modern Photography - Tom Ang

I have been looking a fair bit into picking up a Nikon 610+24-70mm lens for about 4k local or 3.2k grey. The only reason I haven't really jumped on this is that as you can see a lot of my gear is average (Tripod, Bag, Filters). so it might be worth spending it elsewhere.
I have also been looking at the 14-24mm lens to the point where I have even considered not upgrading the D90 and just picking up the 24-70mm+14-24mm lenses.

I don't know what "most" peoples thoughts on grey products are, but it seems like a common way of thinking is that people are more open to buy lenses then bodies on the grey market.

As you can probably tell I am all over the shop with my thinking, I mean I love the idea of getting a new camera but I know that the D90 can perform well so it seems obviously investing in glass would be the better option.

But I am torn....

Any advice would be great.