Need help with a monitor selection

[thecoffeeguy]

I'm trying to find a good monitor that will suit my needs. Let me lay down some things im looking for.

I am a gamer, but not hardcore.

Games currently played:

Team Fortress 2
Call of Duty 4
Company of Heroes

However, I do a lot of internet type work, a lot of reading.

Now, I have a 19" Viewsonic at home and a Dell 20" at work (this one http://accessories.us.dell.com...en&cs=04&sku=320-4687)

The one thing I can dell, without a doubt is that when using Mozilla Firefox, there is a HUGE difference in quality. At home, I can't even using Firefox because the way it displays the pages is crappy. Not clear, fuzzy almost and a PITA to read.

At work though, with my Dell, the monitor is fantastic. I can use Firefox with the pages being displayed perfectly and easy on the eyes.

I guess my first question would be,whats the main difference?

So for me, its striking a balance between the two, but if I had to choose, it would definitely be to get something that would display the internet over gaming.

Also, any opinions on that matter above? I like it a lot, but $460 (before Employee discount), is pretty hefty.

Any other alternatives to consider?

Thanks,

TCG

EDIT: What size monitor do you need to start considering a SLI setup with?
Also, I would like to go with a dual monitor setup. So something that will work well for whatim looking for (Lots of online reading, some programming for .NET, powershell, vbs scripting) as well as the gaming factor as well. What type of things should i be looking for?

Also, what seperates the dell "UltraSharp" models from others? THanks.