I use a single Dell IPS and I've pretty happy with it, so sure. Plus IPS is great for viewing from off-center. I personally have no experience with LED, but I think that a IPS LCD panel would still be superior to a LED TN. All displays will do at least 60hz, so that's not a real issue.. If you want to use 3D glasses, like Nvidia has, you'll need 120hz.
So sure, buy those two.
Edit: Hey i was just looking at the Dell.ca website and they have the monitors you're looking at on sale for $239
WOW! Thanks for that! I checked earlier today and it didn't say that ($100 off).
I actually just picked up 2 Samsung BX2440 LED. I know these are TN Panels, but they do look stunning. To boot, these have a VESA mount, so when I move to 3 panels, I can grab that universal mount I see on the link.
Now I'm torn. :) That is a great deal on the u2311H. Any bit of research I do does seem to suggest it's not as good as the 2410, and its not necessarily as good as the one preceeding it (2309, 2209?). And I've heard this Samsung monitor is very nice...
Hmmm... decisions. I did pay more for this BX2440 than the Dell is currently be sold for.