I have watched more than 200 anime in my life, so let me see if I can help you in this.
Judging from your favorite anime, the harem + romantic comedy genre mix is probably your favorite. I, too, see harem as my favorite genre and I have seen a lot of anime from this genre. Let's recommend you a nice, interesting anime for you to watch.
Are you familiar with
Kaichou wa maid-sama? It's one of the best romantic comedy animes I've watched since Toradora!, a very interesting anime if you haven't watched it yet. It basically is set in a school setting and has two very likable protagonists. Not really a harem, but it has multiple girls liking the main male lead.
Now, let's mix other genres with the harem one. How about
Isekai no Seikishi Monogatari? It's an OVA composed of 13 episodes with 45 minutes each. In my opinion, it's one of the best harems out there, though it is a spin-off of Tenchi Muyo. It has action, romance, drama, school, and ecchi.
The above ones are my really my favorite harem animes, so I heavily suggest you try them out.
Some others would be Love Love, Tactical Roar, My Wife's A Mermaid, Da Capo, Asobi ni Iku yo, Gundam 00, Koi Koi 7, Martian Successor Nadesico, GTO...
Some of the latter-mentioned are new, though will be completed very soon this month. I can recommend you more if you want, when I think of more interesting ones.