Im also searching for a light dramas, i just finished a heavy drama, The bridal mask, & the impact of it is still on me. So i suggest you to try Jdrama that will definitely make you laugh, Nodame Cantabile & Hana Kimi from your PTW list.
If you want something new, Cheongdamdong Alice.
and yeah, Reply 1997 and A Gentleman's dignity will do. :)