Is there a good pci express graphics card out there for under150?
What do you plan to use the video card for? The latest games? The occasional classic?
If you want to play games in the HL2/Doom 3 area with decent performance then I would recommend at least a 6600GT, which can be had for around $180 US and up.
No games, just basic stuff.
Oh, well, something like this or this then.