2668 74u vs 2668 J1U

[eigh]

ftp://ftp.software.ibm.com/pc/pcinstitu ... tabook.pdf

differences are:

74u:
2ghz
5400rpm
ibm wireless

J1U:
7200rpm drive
2.13ghz
intel 2 wireless


i dont know how much the J1U costs. i know i wouldnt NEED the faster cpu, most of the time i would run it on battery and only use 800mhz or so of its speed. while i hear that the 7200 rpm drive would be better, im worried that it will drain more battery power. im also worried that the intel wireless will be crappier (although a tad more gentle to battery life).

if they are the same cost, which one should i get?