Let's have some simple spec estimations then; processor, HDD, RAM, optical drive, GPU etc. for each model.
Some fairly reasonable estimates would be:
Low-end: $1799
15.4" LED display with 1440*900 resolution
2.4 GHz Core 2 Duo with 1067 MHz FSB
2 GB 800 MHz DDR3 RAM (up to 8 GB)
200 GB 5400 RPM HDD
256 MB GeForce 9300M G (or 9500M G)
8x DVD+R DL
Midrange: $2299
15.4" LED display with 1440*900 resolution
2.53 GHz Core 2 Duo with 1067 MHz FSB
2 GB 800 MHz DDR3 RAM (up to 8 GB)
250 GB 5400 RPM HDD
512 MB GeForce 9650M GS
8x DVD+R DL
High-end: $2799
17.0" LED display with 1680*1050 resolution, 1920*1200 option
2.8 GHz Core 2 Duo with 1067 MHz FSB
2 GB 800 MHz DDR3 RAM (up to 8 GB)
300 GB 5400 RPM HDD
512 MB GeForce 9650M GS
8x DVD+R DL
Low-end: $1999
15.4" LED display with 1440*900 resolution
2.53 GHz Core 2 Duo with 1067 MHz FSB
2 GB 800 MHz DDR3 RAM (up to 8 GB)
200 GB 5400 RPM HDD
256 MB GeForce 9650M GS
8x DVD+R DL
Midrange: $2499
15.4" LED display with 1440*900 resolution
2.8 GHz Core 2 Duo with 1067 MHz FSB
2 GB 800 MHz DDR3 RAM (up to 8 GB)
250 GB 5400 RPM HDD
512 MB GeForce 9650M GS
8x DVD+R DL
High-end: $2799
17.0" LED display with 1680*1050 resolution, 1920*1200 option
2.8 GHz Core 2 Duo with 1067 MHz FSB
2 GB 800 MHz DDR3 RAM (up to 8 GB)
300 GB 5400 RPM HDD
512 MB GeForce 9650M GS
8x DVD+R DL
Low-end: $2299
15.4" LED display with 1440*900 resolution
2.53 GHz Core 2 Duo with 1067 MHz FSB
2 GB 800 MHz DDR3 RAM (up to 8 GB)
250 GB 5400 RPM HDD
256 MB GeForce 9650M GS
8x DVD+R DL
High-end: $2799
17.0" LED display with 1680*1050 resolution, 1920*1200 option
2.8 GHz Core 2 Duo with 1067 MHz FSB
2 GB 800 MHz DDR3 RAM (up to 8 GB)
300 GB 5400 RPM HDD
512 MB GeForce 9650M GS
8x DVD+R DL