You are in a different position than most having spent the $1500 for the 3.0 Ghz Clovertown CPUs. Call it poor, cheap whatever you want, but as a college student I find that it makes more sense to save money. Especially $1500. Because, if all the thoughts here are correct an all octo Mac Pro (whenever the update comes) would be a lot cheaper than $1500, on top of the $2500, in fact, an octo could come in at $2500. Assuming they use the 2.83Ghz chips in the base model, that Mac Pro will perform as good or better than yours, for $1500 less. Sure you may have made that money back. Kudos. But I don't make that much on my jobs as I simply don't have the time to do large and high paying ones.
Anyhow, my point is that you aren't the norm. Most people are shelling out that much for a Mac Pro. Maybe because they don't have, maybe because they don't think it is smart. Whatever. But simply reducing the new Mac Pro to 20% faster is ignoring the majority who would buy the base model, in which case the performance increase is monster.