http://www.smashingmagazine.com/2008/10/13/pricing-tables-sh...
Look at WuFoo's design, they do an incredibly great job at the price chart, and they can back up their decisions with data.
On the other hand, if your service is not something you're trying to upsell people on based on gimmicky features, I strongly suggest following the Slicehost model: http://www.slicehost.com/ They know you know what you need, so they very plainly list all of the plans and their prices with no gimmicky sales bullshit. I love them for that.
I don't think highlighting the most expensive package to make the others feel cheaper by comparison is very user-friendly either. Users want to quickly find the best package for them and not feel like they're compromising by picking something other than the highest level. Highlighting the highest package sends a signal of inferiority for the rest of the items. By highlighting the middle one, they're saying "hey this is a great package" on its own. If you need more, go higher. If you need less, go lower.