IBM Thinkpad T40 vs. R40/50

Hello! I have decided to get an IBM Thinkpad from the website:
http://www.usanotebooks.com . I do like the T series, however I think
the R series may provide the same amount of power and most of the same
features for a little less. The specs for the T40 are: 1.6 Ghz Pentium
M, 1024 MB RAM, 80 GB HDD, 14.1" XGA, 10/100 LAN, 802.11b, Combo
Drive, ATI Radeon 7500 32 MB. That costs $445 ( 6 month warranty btw )
THe specs for the R50 are: 1.4 Ghz Pentium M, 256 MB RAM (add $20 for
512), 30 GB HDD, 14.1" (IDK the resoultion), Gigabit LAN, 802.11b,
Combo Drive, ATI Radeon 7500 32 MB. That costs $385. The specs are
pretty similar. Do you think it is worth the extra $60 for the T40? I
know the R series is bulkier and heavier, but this model is 1 pound
heaver, but is very thick and bulky. I would not really benefit from
Gigabit LAN, as I don't have a gigabit router. 802.11b wireless is
sufficient for web browsing, which is what I do. Most of the time when
I'm doing hard work on it, it will be plugged into ethernet with AC
power anyway. I heard the R50 has 4 hour+ battery, but the T40 has 5.5
hour battery (all standard batteries (6 cell)). Battery life is
important, but with most places offering AC outlets, im sure 1.5 hours
will not kill me! Thank you very much to anyone who contributes! It is
very highly appreciated! :-)