My local classic camera guru, who has bought and sold cameras for years, steered me away from the Ikoflex. In his opinion, they were more prone to failure than their Japanese counterparts, and his advice has always worked out well for me. He sold me a 124G which had recently been CLA'd, and it's been a joy to use ever since. I also have, and prefer, a Minolta Autocord, mostly because the ergonomics suit me better.
The Yashica D is OK, but the Yashikor lens is not as good as the Tessar-type Yashinon lens found on the 124.