I have to agree with the masses here too. My Asus 21.5" 1920x1080 looks great. You can probably wait for the video card until prices drop, or find a used 4870 for some crossfire action. My 4850s in crossfire completely shred Mass Effect 2 at 1920x1080, so if you are going for the bang for buck I say find a cheap 4870 for crossfire, buy the Asus monitor, and wait 6-9 months for the HD5000 video card.
Edit: Ok maybe just wait 2-3 months for the HD5000