The WAP54G has more removed than just the switch and WAN port. It's got less flash and RAM than a WRT54G.

If you're steering clear of Linksys APs then you've got to keep away from most other APs as well. They're nearly all based on the same reference AP design by a company called CyberTan. The main differences between the various APs is the web interface, casing, antennas and possibly the flash & switch chip brand. The radio and CPU are always a Broadcom component.