Nikon lens options

for wildlife fotography ie. action as well as still life in low light conditions, what lenses would give the best results without any or limited correction? a 70-200/f2.8 vr with a tc 1.4 or tc 2.0 teleconverter or a 70-300/4.5-5.6 vr. i would appreciate to have some replies to the pros and cons for both.

I borrowed my buddy's 70-300mm VR and I really did like it. It seemed really sharp, but it had some focusing issues. The price is good though. Here is one of my favorite shots I took with it http://www.viovio.com/photos/image/755865/22413.

I recently bought a Sigma 150mm-500mm f5-6.3 OS. I have a taste for fast glass, but at over $1,700, I decided to go with more zoom and less f-stop at just under $1,000 rather than the 70-200mm VR you are considering. Here is a sample photo I took with it. http://www.viovio.com/photos/image/960244/19786

I notice a wavy aberation in the OOF backgrounds and sometimes a color aberation around the edges. I'm assuming these are created by the Optical Stabilization. It does focus quickly and smoothly. This lens is so new, I haven't seen any reviews on it yet. (...OOOPS, spoke too soon. There is a review right here on the forum.) I can tell you it is big and heavy. It comes with a soft case and strap which is good because it wont fit in my bag.It uses a 86mm filter. A plain UV filter is cheap enough ($35), but a polorized filter will set you back more than a new 50mm f/1.8 lens. Of course if you're considering the 70-200 VR, the price of a couple of filters won't make you blink.

The VR (or OS for Sigma) will make up for handshake and give you the equivilent of a couple of stops faster, but since you're into nature photography like me, fast glass will give you a better edge on a subject on the move, especially in early morning and evening light when creatures are out, (even though there are VR and OS settings to compensate for subject movement). The 70-200mm VR gives you both and with the teleconverter you can take it to 400mm. Just remember that a 2.0 TC will double your f-stop. So you will essentially have a 140-400mm f/5.6 VR. I'm assuming that the VR function will still work with the TC?

Well that's my 2 cents, but I will tell you to pretty much ignore what I said and check out Ken Rockwell's site for some very insightful reviews on almost every Nikon DSLR and lens made. http://kenrockwell.com/