Hi. I have four Nikon lenses.

50mm AF f/1.8(D)

17-35mm AF f/2.8D IF ED

35-70mm AF f/2.8D IF ED

80-200 AF f/2.8D IF ED

I was recently told that I would be better served to own a 105mm f/2.5 or 105mm f/2.8 lens (both manual focus using a D700).

I began researching on my own and I read a bunch of blogs (like Ken Rockwell's)

He brags about both Nikon 105mm lenses but he loves the Nikon MF 85/2 (85mm f/2).

At this point, I have no idea what I need. I've studied hundreds of photos and I'm a bit more confused than what I was when I started. I want great Bokeh. I've seen examples in this with both the 85/2 and the 105mm (both 2.8 and 2.5)

I will likely use the lens I choose for close-up bugs, water droplets, flowers etc. However, is it realistic to expect to use the same lens for great, vibrant portraits where the subject is nearly pulled out of the picture (away from the blurred background). I'm not a wealthy person. Some of the lenses I own were passed to me by a departed friend. One of them was part of a silly trade.

I would truly appreciate a knowledgeable opinion about what to do.

I want to stay in the Nikon family. If you have other suggestions within Nikon, please share. THANKS!