As for price, this obviously depends on where you live (or order). Compare http://tweakers.net/pricewatch/304000/wd-my-book-live-duo-6tb.html with http://tweakers.net/pricewatch/411798/synology-diskstation-ds214-6tb.html But you're right, the price difference is 76 dollar rather than 50 dollar. Still a small difference, I think.
I bought my DS cheaper than advertised on the above site. For about 70 euros more, you've got a machine that is incredibly better designed than any WD NAS in almost all respects. I was like you once, applying Teinturman's "hack' against overheating my WD MyBook. I'm a bit older and wiser now. I think the 70 euro (50 in my case) more is well spent — it prevents headaches and panic. WD are nice hobby machines, but if you want reliability, ease of maintenance and install, definitely look into Synology.
Try a Synology DS and I think you won't regret it. Though I must admit the one positive aspect about the WD device is this forum, especially when it was still vibrant (till about two/three years ago). The synology forum is not so active as this forum was in 2010, but that's also because there are fewr problems with it and support is quite good.