[ubuntu] Please recommend graphics card

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http://ubuntuforums.org – I am running Ubuntu 12.04 64 bit on an Acer Aspire X1420 which dual boots with Windows 7 64 bit. When booting Ubuntu normally I find that the GUI does not start. I then select the previous kernel in GRUB and it boots up fine. I am thinking this is a driver related problem and I am thinking of getting a new graphic card. This will need to be the PCI-16 express format as the computer is a relatively small form factor design. Also it only has a 220W PSU. I do not need the graphic card for gaming so I do not want an expensive one, just reliable. Can anyone recommend one please? (Hardware)