Went to camera store today and tried the following:
Nikon 70-300VR
Nikon AFS 60/2.8
Sigma 100-300/4
I had already made my mind up to get the 70-300VR even before I tried it having read good reviews so I left with one bolted onto my camera. It's very solid and makes my rattly 18-70 feel like a toy

I haven't really had the opportunity to use it much but here are some I snapped an hour ago.
70mm, F4.5:

(a tad soft, but that's because of my unsteady hands at 1/15

It really doesn't work that well indoors.)
300mm, F5.6:

(just a tad soft, but perfectly usable if resampled to smaller resolution)
Again, very pleased with how the AFS 60/2.8 performs. Here's a picture I took with it @ F3.5:

It searches a little but still locks on fairly quickly. Build quality is superb. As you can see, it is very sharp too. This will almost definitely be my next lens. I love taking photos of food so it'll be
perfect!!! Now I need to save for it...
Then the Sigma 100-300/4 caught my eye. Boy is it large. I don't think it is as heavy as the 70-200, but it looks every bit the part. Build quality is probably just as good. The zoom ring is on the stiff side. Very sharp, but horrendously difficult to shoot hand-held at 300mm. I apologise for the boring subjects, but these were all that I had to work with
100mm, F4, ISO 1000:
300mm, F4:
100% crop of same picture:
