I have a WX3in1 Plus 2.0 myself. I am using it with an Alinco DR-135 III.
My first Alinco had the built-in TNC and after some investigation I discovered that the WX3in1 required the analog (audio level) signals coming from the DB9 and that the RS-232 would not work. I removed the TNC board and performed a factory reset and it has worked happily ever after. As a side note, my 2nd Alinco did not have the TNC board option installed. Apparently they discontinued it.
Microsat has the cable for the Alinco at
http://microsat.com.pl/product_info.php?cPath=43_45&products_id=156I have a J-Pole in the attic and although the range is limited because of that (and my location) when an APRS tracker comes within range it works fine.
I also have my Davis VP2 feeding data to it.
KE8DAF-13I know that this isn't mini-DIN to mini-DIN, but it works well. The Alinco is $169.95 at DX Engineering. That plus the CAB-43 cable would be well within your $200 budget. You have to order the cable from Poland, I haven't seen it available here in the States.