New GPU for my Acer Aspire X3400

I know there are some threads on here asking the same question as me and there are some answers, but the threads are at least 2 years old and i dont know if there are any newer cars that will fit my PC. The card which was used from the guy in the older thread was this (http://www.newegg.com/Product/Produ...p=&AID=10446076&PID=6146962&SID=159riwbeydpv8) and he said it ran fine, heres the thread (http://forums.majorgeeks.com/showthread.php?p=1553712#post1553712). So does anyone know of a better card than that one also i cant find that one to buy it is out of stock everywhere i assume because its out dated.