Tweeters -

In about a month I'm taking a trip to Arizona. I bringing my camera, but the
longest lens I have is only 135mm. I'm looking for the cheapest 400mm zoom
f/4.5 I can find. I can get a Vivatar 100-400/4.5-6.7 for $214, or the same,
except it's Tokina, for $229. Which deal is better? Are there better deals
out there? I'm desperate!

Thanks,

Tyler