If AMD X2 is the better processor, then what are the best and most efficient hardwares to match w/ X2?

Answer 1

Well, it depends on how much you wanna spend on these stuff, to achieve better cost performance, it is suggested that you pick 1GB RAM, 250GB hard disk, 7300GS/GT or 7600GS/GT video card, 17/19" wide screen LCD, etc.

Answer 2

Actually the Intel Core 2 Duo Line:

http://www.gamegiants.net/advanced_search_result.php?keywords=duo&categories_id=2&inc_subcat=1&page=1&sort=3a

beats the AMD X2 in almost every benchmark. I think you might want consider it with a compatible motherboard.

Answer 3

You could consider this:
http://arstechnica.com/guides/buyer/guide-200703.ars/2

OR this:
http://www.techreport.com/reviews/2006q4/nforce590sli-intel/index.x?pg=2