[all variants] Ideal graphics card for 3/4 screens

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http://ubuntuforums.org – Hi, I would like suggestions for an ideal graphics card to drive 3/4 screens for my new work machine (64Bit 8Gig of ram). I am a software developer and I won't be playing games but would like to be able to use VirtualBox in seamless mode and use Compiz. I currently use a Matrox card, which does work but I am unable to use Compiz. A colleague has suggested a NVIDIA Quadro NVS 450 or 420. Thanks in advance, Ian (Hardware)