When you say large, do you mean Something like a 30", 2560 x 1600 Dell display? http://www.overclockers.co.uk/showproduct.php?prodid=MO-023-DE&groupid=17&catid=1120&subcat=
Large IPS displays suffer from poor pixel response rate/ghosting, this makes them terrible for gaming, especially Aces High 2! They are built for professional use, photo editing/cad work. I suggest you stick to the faster 1920x1080, TN panel, 24" displays.
Having three displays in eyefinity will not reduce the resolution. Think of it like this, you're just gaining 2 additional displays beside your main display. For example: 1920 x 1080 x 3 = 5670x1080.
You'll not notice the bezels after 10 seconds of use, you can even stack the bezels behind the centre display for even more of a reduced effect. Backlit LED monitors do this really well as they're ultra thin.
Now if you're really minted, you should look at the new 120hz displays which will be flooding the market soon.
I had been thinking about something over 30" actually, but I didn't notice that about the ghosting, does that still apply on the newer stuff out there? I'm not having a ton of cash just yet, but apparently the girlfriend and I are no longer a couple and I'll be out on my own, which will mean a good bit of extra cash after I get caught up for a couple of months.
So it sounds like the best way to go would be to get three good quality slightly smaller units then if this ghosting is really an issue. I'll have to look into the 120hz monitors then too, maybe I can start with a single and then add other matching ones as I go. Maybe I should add a second 5850 card in to help out.
Thanks for that info, you've given me a good starting place.