One lens I can recommend (and it only arrived today, alongside the Nikkor 14-24) is the Sigma 15-30. If you are looking for someone with a D700 in mind, then from what I have seen over a quick test shoot, the 15-30 is a real sleeper lens. Very impressive.
the tokina is a decent lens. i used this lens quite a bit on a D1 and D100 to cover autoshows. it needs to be stopped down to around f/5.6 or so to get good sharpness. color rendition is on the cool side, typical of tokinas.
the one major issue my copy had is a weird triangular rainbow ghosting that i haven't seen on any other lens.
i'll provide some images when i get home as work blocks access to pbase.