Graphics Card Upgrade (Again)

After the thread I posted in the help section which regarded my resolution problem, I've decided to try and upgrade again and hopefully this time, will get it right.

My preference would have to be nVidia since I've enjoyed using their graphics cards in the past and would like to carry on that trend. My motherboard is an AGP and I have no need to upgrade to a PCI-X since this won't be playing many games.

Does anyone have any suggestions on what would be recommended? I've been having a look at series 7 and 6 of the nvidia range and from different manufacturers but can't seem to choose.

How ya doing, buddy?

My bad for not posting enough specifications.

My monitor is a DELL 2405FPW which uses a DVI-I link and also allows VGA (another reason why I like this monitor).

The graphics card must be able to support the DVI connection on this monitor to allow the higher resolutions to be reached (1920x1200) since my last attempt at upgrading failed.

Because of my current setup, I'm thinking of moving the GeForce FX 5900 Ultra from one machine to the other so that that machine can work right now and I can purchase a new graphics card to put into the other machine.

What I thought might be interesting, would be to get a graphics card in the 6th series because I already have a 5900 and a 7950. This way, there would be a graphics card from each model in each of my machines.

There's nowhere I can't reach.

In both cases, I have an Antec 550W power supply which should be more than enough to supply power.

As you suggested, I'm going to try the 5900 Ultra in the other motherboard first and post the results. Also, I know for a fact this graphics card works at the resolution I want on the 2405FPW cause its currently hooked up to other 2405FPW that's on my desk.

This thing is sticky, and I don't like it. I don't appreciate it.