Hi, I took the liberty to look up what you might be trying to buy at TigerDirect. The only PCI nVidia card I see that they are currently selling is the eVGA GeForce MX 4000. Is this the one? The specs for this video chip is here:
http://www.nvidia.com/page/geforce4mx.html
There is a PDF product overview you can download and read. It says that it does support T&L. However, I own a copy of Star Wars Battlefront II. The box, however, under chipset supported specifically says that GeForce 4 MX is excluded. I have no idea why. Personally, I'm using an older GeForce 4600 and it runs just fine.
With regards to video memory, the more memory you have, the higher the resolution and detail you can run. It adds the to the 'eye candy,' giving a more enjoyable experience. But obviously it will run on less.
If you would like to upgrade the card to one that won't have the chipset controversy regarding GeForce 4 MX and use 128mb, I see that TigerDirect sells one very reasonably:
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1010678&CatId=697
It is an eVGA GeForce FX 5200 with 128mb and it is a PCI card.
Hope this helps.
Merry Christmas