帮忙参考（香港学生机）

junzai

这是同学发给我的配置及报价：
ThinkPad X40
HK$9,228
Processor Pentium M 1.3G LV  
L2 Cache  1MB
Memory 256MB DDR RAM (333MHz)  
Hard Disk  40GB disk (4200rpm)  
Graphics Intel Extreme Graphics 2
Display 12.1" TFT (1024 x 768)
Communication Modem, LAN,
802.11b/g 54M wireless
Media 2 x USB 2.0, SD slot, IR, VGA
OS WinXP Pro (Eng./Chi.)
Dimensions 10.5" x 9.3" x 0.81-1.06"
Weight 3.1 lbs  
Battery Life  7.5 hrs*
Warranty 3-year carry-in
international warranty
------------------------------------
ThinkPad T42/1.5G
HK$9,876
Processor Pentium M 715 1.5G
L2 Cache  2MB
Memory 256MB DDR RAM (333MHz)  
Hard Disk  40GB disk (5400rpm)  
Optical 24x/24x/24x/8x
CDRW/DVD Combo
Graphics ATI Radeon 7500 (32MB)
Display 14.1" TFT (1024 x 768)
Communication Modem, LAN,
802.11b/g 54M wireless
Media 2 x USB 2.0, parallel, IR,
S-video out, VGA
OS WinXP Pro (Eng./Chi.)
Dimensions 12.2" x 10" x 1"
Weight 4.5(4.9) lbs  
Battery Life  4.5 - 5 hrs*
Warranty 3-year carry-in
international warranty
----------------------------------------
ThinkPad T42/1.6G
HK$11,448
Processor Pentium M 725 1.6G
L2 Cache  2MB
Memory 256MB DDR RAM (333MHz)  
Hard Disk  60GB disk (5400rpm)  
Optical 24x/24x/24x/8x
CDRW/DVD Combo
Graphics ATI Radeon 9600 (64MB)
Display 14.1" TFT (1400 x 1050)
Communication Modem, LAN,
802.11b/g 54M wireless
Media 2 x USB 2.0, parallel, IR,
S-video out, VGA
OS WinXP Pro (Eng./Chi.)
Dimensions 12.2" x 10" x 1"
Weight 4.5(4.9) lbs  
Battery Life  4.7 hrs*
Warranty 3-year carry-in
international warranty
----------------------------
ThinkPad T42/1.7G
HK$12,384
Processor Pentium M 735 1.7G  
L2 Cache  2MB
Memory 256MB DDR RAM (333MHz)  
Hard Disk  60GB disk (7200rpm)  
Optical 24x/24x/24x/8x
CDRW/DVD Combo
Graphics ATI Radeon 9600 (64MB)
Display 15" TFT (1400 x 1050)
Communication Modem, LAN,
802.11b/g 54M wireless
Media 2 x USB 2.0, parallel, IR,
S-video out, VGA
OS WinXP Pro (Eng./Chi.)
Dimensions 13" x 10.6" x 1.2-1.4"
Weight 5.3(5.7) lbs  
Battery Life  4.7 hrs*
Warranty 3-year carry-in
international warranty
-----------------------------------
ThinkPad X31
$7992
Processor Pentium M 1.5G
L2 Cache  1MB
Memory 256MB DDR RAM (333MHz)  
Hard Disk  40GB disk (4200rpm)  
Graphics ATI Radeon 7000 (16MB)
Display 12.1" TFT (1024 x 768)
Communication Modem, LAN,
802.11b/g 54M wireless
Media 2 x USB 2.0, parallel, CF slot, IEEE 1394, IR, VGA
OS WinXP Pro (Eng./Chi.)
Dimensions 10.7" x 8.8" x 0.98-1.18"
Weight 3.6 lbs  
Battery Life  5.5 - 6 hrs*
Warranty 3-year carry-in
international warranty
-------------------------------------------
ThinkPad R51
8820
Processor Pentium M 715 1.5G
L2 Cache  2MB
Memory 256MB DDR RAM (333MHz)  
Hard Disk  40GB disk (4200rpm)  
Optical 24x/24x/24x/8x
CDRW/DVD Combo
Graphics Intel Extreme Graphics 2
Display 14.1" TFT (1024 x 768)
Communication Modem, LAN,
802.11b/g 54M wireless
Media 2 x USB 2.0, parallel, IEEE 1394, IR, S-video out, VGA
OS WinXP Pro (Eng./Chi.)
Dimensions 12.4" x 10.2" x 1.3"
Weight 5.6(6.0) lbs  
Battery Life  4.7 hrs*
Warranty 3-year carry-in
international warranty
--------------------------------------------------
ThinkPad R50e
$5988
Processor Celeron M 330 1.4G
L2 Cache  512KB
Memory 256MB DDR RAM (333MHz)  
Hard Disk  30GB disk (4200rpm)  
Optical 24x CD-ROM
Graphics Intel Extreme Graphics 2
Display 14.1" TFT (1024 x 768)
Communication Modem, LAN
Media 2 x USB 2.0, parallel, VGA
OS WinXP Home (Eng./Chi.)
Dimensions 12.4" x 10.2" x 1.3"
Weight 5.9 lbs  
Battery Life  3.5 hrs*
Warranty 1-year carry-in
international warranty
------------------------------------------
在这里好像找不到相同的机型，请大家介绍一个大致的报价。
不知买这些机型是否值得，大家推荐一下。
另外还请大家介绍一下购买学生既要注意什么哪些问题，比如保修等。
谢谢！