it really depends on what you plan to do with the system.. if you just use it for web browsing and daily use with a little light gaming.. then no the core 2 duo is a far better choice..
the only reason to go with the i7 is if you do video encoding/editing on the fly or really heavy gaming.. other then that the i7 in a laptop is completely useless..
main/gaming/distributed computing rig
phenom II x4 940 @ 3.5ghz 1.476v, Biostar TForce 780g m2+,2x1GB corsair XMS2 and 2x512mb kingston generic ram 3GB total, evga 8800GT 1.1v mod (756/1890/1015), Antec 300 w/ 5 tri-cool fans on high. 3.2TB HD space
HTPC/distributed computing rig
AMD athlon 64 x2 6400+, Asus m2n-sli deluxe, 2x1GB Crucial Ballistix Tracer 2.4v, Powercolor 8800GT accelero S1 (630/1836/1050), Xclios Windtunnel version 1 case