I have owned the 105D, a Modwright 105D and I currently own the 203 and the 205. If you are using the Oppo as your BD player or you have or conceive of having 4K, you should acquire either the 203 or 205. If that is not a goal at all, then stick with the 105. FWIW the Modwright 105D is a vast improvement in SQ IMO over the stock 105.
Should I buy the Oppo BD 205?
I stupidly bought the Oppo BD105 used for almost the same price as a new 205 about the time the new player came out. My question is, is it worth buying a 205 at this point before it disappears? Is it that much better?