I personally loved Reply 1997 out of all of these. It's a sweet high schoolish rom-com about growing up in Korea during 1997, the start of the Kpop craze. It's hilarious, sweet, and very romantic.
However, I'm currently watching Gaksital and I'm loving it. But it's not a light and fluffy romantic drama. It has a City Hunter sort of feel to it.
And I have heard that Queen In Hyun's Man was the best romance drama of this year. The main couple in the drama are a couple in real life, which really helps the chemistry I heard. Though I haven't watched it yet, I'm planning on watching it during my winter break.
Other ones on your lists that I've watched and liked are:
A Gentleman's Dignity - it's a mature rom-com about men in their 40s. Who knew ajusshis could be so hot.
Rich Man, Poor Woman - it's only 11 episodes averaging about 45 minutes each. It's a sweet drama. Plus Oguri Shun is pretty fine.
Other comments:
Faith - I started watching it, but the pacing was so slow. I mean I love Lee Min Ho, but I hate slow moving plots.
Arang - Same thing, the plot moved a bit too slow for me, and I didn't feel the romance as much as many others did, so I stopped watching, but I may actually pick this drama back up again, because I really like the premise.
Moon That Embraces The Sun - I read the recaps on Dramabeans.com and I did start to watch it, especially because Kim Soo Hyun is one of my favorite actors. But the plot was so predictable and circular. There was nothing more to it than the King trying to get back his first love.
Time Slip - Didn't even bother watching it because of all the poor reviews.
The ones that I haven't mentioned, I do want to watch them, but haven't gotten around to it yet. Though I haven't heard a lot about Ghost.
Hope this helps!