yes=) that was my assumption actually.
the 9600 is going to be a huge upgrade from the 8400
(i just responded to 2 posts with pretty much the same answer..)
Newegg.com - Palit AE+38500+HD52 Radeon HD 3850 512MB 256-bit GDDR2 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Desktop Graphics / Video Cards
is also a great card for the money
if you want to spend a little more, the 4850 is only about 169.99 now on newegg
(the 8800 series geforce, and 9800s are great cards, but they are also very expensive... at this point the 3850, 9600, and 4850 are the best options in my opinion)