Hello Ron,
by the way, my daughter would say "you are talking all the time of a w3150, how could I know that you actually mean a w3150APLUS"..., but I think, I should have seen this by myself.
I still think, that the w5100 should be operational. too. I would prefer the two chip solution, but it's clear to me from the data sheets that the w3150a+ (and only this new type!) is functionally equivalent, so it should be able to change the device at any time.
Regarding the lantronix XPort, my opinion isn't as bad. As a serial TCP server, it has become a standard in the last years. One problem is however, that the code must fit into the on chip 256 kB SRAM, this is a serious limit for protocol extensions. There is also an option of building your own XPort firmware with lantronix TCP libraries. As a serial server only, the new XPort Direct has an interesting price, however the flash has been reduced to 128 kB and features like E-Mail have been discarded completely. Also the XPort AR is an interesting device, but rather expensive. Thus the Wiznet/AVR solution is really interesting.
Regards,
Frank