Dell ultrasharp 2000FP 20" flat panel LCD with the Mac Pro?

My husband is planning to buy a Mac Pro. He already owns a Dell ultrasharp 2000FP 20" flat panel LCD. He was going to get an Apple Cinema Display if they'd been updated, but they haven't been, so we're thinking of waiting until they're updated, as he'd like to have built-in iSight. What are the disadvantages of the Dell display compared to buying an ACD right now? I called the Apple Store to see if the Dell was even compatible with the Mac Pro, and she told me that if we bought a DVI-DVI adapter, that would work. I asked, "Wouldn't that just be a DVI cable?" She said no. Then I asked if Apple sold this, and she pointed me to the mini-DVI/DVI adapter. I asked her if the Mac Pro had a mini-DVI port, and she wasn't sure. So, I'm not sure how we can get reliable advice on this matter from Apple, as I can't seem to find a way to email the Apple Store for questions.

I'd appreciate any advice you may have. Thank you 🙂