Okay, I'm just posting this here, because it is an often neglected and unknown possibility. There is a small 10MBit TP network module for the Algor and Highway USB cards. This add-on is a bit cheaper than the stand-alone network cards. However, it is of course more expensive for only buying a network, as you have to buy the Algor or Highway USB carrier board (although this will give you USB and 512KB FlashRom). The card (combo) itself does not obscure a video/PCI/ISA slot because it is just as large as the Zorro slot (unlike the X-Surf/Ariadne). However, you don't get the additional IDE ports of the X-Surf. There were some reviews in several Amiga magazines.
This is just for information, not for advertising the product. Find out more yourself
