A new crapics card....should I?

Since I play a lot of games i decided i need a new graphics card to be able to play some of the newer games i want. My graphics cards is currently ATI Radeon Xpress 1150, up to 128-MB shared system memory. Thats kind of low for me. I have a hp compaq nx 6325 laptop and i was wondering whether i should change it and to what.
I can add additional info if necessary but its all available on the following address
http://h18000.www1.hp.com/products [...] 7_div.HTML

Okay the first thing you should be aware of is that that is an integrated graphics chip, you currently do not have a discrete card. As a result I don't think you have a slot to plug one in.

However, the express card slot is capable of PCI-E. There is not an express card graphics accelerator but you can purchase a "PCI-E expansion chasis" to plug a low power card into (no more than 55w).

http://www.expresscard.org/web/site/qa.jsp (ctrl+f search for graphics)

http://www.magma.com/products/pcie [...] index.html

This will all get very expensive very fast so I can't really recommend it.