Given only these two I will not note any other similar models.
The Gateway gets the nod here for the 549.99 price, the 4500MHD graphics runs more games that you may expect and for me the 14 inch screen is just too small for me so I'm back to the Gateway.
Be sure to test drive one. You can't buy on spec for keyboard feel and LCD viewing qualities.
Asus U81A : http://www.bestbuy.com/site/olspage.jsp?skuId=9366562&type=product&id=1218092151327
Gateway MD7818u : http://www.circuitcity.com/applications/searchtools/item-Details.asp?EdpNo=5210430&SRCCODE=CCDAFFL&cm_mmc_o=-ddCjC7BBTkw**%20**zuubkbzfwlCjC-d2CjC-uu&id=k54384&sessionid=gan_144600607
This is for school use and entertainment use (movies, music etc) please help!