If you have a Display port capable monitor, definitely use it!
Unless I'm missing something you should be able to connect the Dell via Display port, and use the DVI and HDMI connectors/cables for the Acers. No adapters required.
Thank you both for the responses, it sounds like the U3011 is a beastly option that can definitely work even for gaming.
If I did go one big monitor I'd definitely want to add wings for non-gaming, the problem is there are absolutely zero 1600x1200 screens on sale here, they're all 1600x900...
For those who've tried both, is it really difficult gaming on larger (27"+) displays? Or do you prefer it to triple-monitor setups?
I've been wanting to jump into Eyefinity, looking at 3x24" monitors (5760x1200 if possible) primarily for gaming with light non-graphics-related office work...