Best lenses/equipment for weddings?

I'm just getting out of the "amateur" stage of photography, and have shot weddings before. I used a Nikon D7000, and the lenses I used were the Sigma 17-70mm, Nikkor 50mm 1.8, and the Nikon 18-105mm. I'm looking to get a couple of better lenses for this coming year's weddings. Which 2 should I get? I was thinking another prime lens, and another telephoto lens. I'm not worried about a price tag, and want the best (that will work well with my DX until I get full frame)

Would getting the Nikon 85mm 1.4 be too much work to use on a crop frame?
I was also thinking of the Nikon 55-300 mm, would that work for weddings?
I have an assistant that would be using a telephoto in the back and I would probably use the 17-70 up front, and a prime for portraits.

I'm self-taught, so forgive me if I don't make sense or have the 'photographer lingo' or whatever it is that makes them sound like pros, lol.

I guess another question I could ask is: What all should be in my bag as a wedding photographer?

So far I have:
Nikon D7000
Sigma 17-70mm
Nikkor 50mm 1.8
Nikon 18-105mm
Nikon SB700 flash (plus diffusers, bounce cards, etc)
Tripod
Reflector
Total of 48GB of memory cards
2 extra camera batteries
16 rechargeable AA batteries for flash
Remote shutter release

We will be getting a second camera in March, also.

Added (1). We're getting a second camera, flash, etc in March. Along with another lens or 2.

What are the two new lenses going to give you that the others aren't? Why spend money, if you don't have to… You might want to perhaps look at upgrading your camera - IF you need to…

you would be better with a second camera body to supplement the one you have… In case of problems… Always have a redundancy… Second body, second flash, etc…

I have shot weddings too.basically you need the 50mm 1.8 and a 70-200mm 2.8 (rent one until you can buy it). You want the 50 because a zoom has a high risk of getting bumped by guests indoors and 1.8 is great in low light.invest in a couple alien bee strobes for reception and portraits.don't forget to shoot in raw mode the entire time.