While I can't provide any recommendations specific to your case, I've been using Wireshark
for a couple of years now, and know that you can specifically instruct it to filter out everything but port 80 traffic.
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:18.104.22.168) Gecko/20090910 Shiretoko/3.5.3
Laptop: HP Compaq nx6325 - Turion 64 X2 @ 2GHz, 2GB DDR2, 100GB HD, ATI Radeon X300, 15" LCD, Seven Pro
Handheld: Palm Treo 650 - Intel PXA270 @ 312MHz, 10MB RAM, 32MB flash, 2.7" LCD, Palm OS 5.4