I am looking at two HP desktop computers for editing AVCHD files with Vegas Pro. The first is the HP 1330z and it features the AMD FX-8120 eight core processor [3.1 GHz, 8MB L2/8MB L3 cache]. The second is the HP 1240t and it features the i7-3770 quad core processor [3.4 GHz, 8MB Shared Cache]. Both include Window 7 Premium Home 64 bit OS. The latter is $100 more than the former. Which would be best for my intended purpose?? Thank you!