Don't do websites myself but the T500 is configurable with switchable gfx and a powerful enough CPU. Also, I am not sure what the maximum resolution on the sony would be but the T500 is 1680 x 1050 which I would think would come in handy having the extra realestate.
Also, is this going to be travelling or staying on the desk, I say this as with the intel intergrated gfx you can get about 5-6 hours of battery life easily enough depending on what you are doing.
Another point would be if you are connecting to an external monitor as the T500 uses display post as it's digital video out so don't know if that makes a difference or not.
Still a solid enough notebook from my experiences so far.