If you need long battery performance, don't get one of these - about 1.75hrs. But if you want power and performance:
http://www.ebay.com.au/itm/ASUS-G73S...#ht_4599wt_922
Sometimes eBay you can be a bargain, but just buyer beware. I just bought x3 of these here and all for $825. 12mths manufacturers warranty to boot. Nearly keeps up with my dads new high powered Alienware unit.
Good luck,
Steve