You're welcome to suggest others, but I have my mind set on that area so it will be an uphill struggle 
I will give you all the options you have in Dwilight
The area hasn't had war for a very very long time.
I hear from Several people that Terran is a diverse and interesting realm with good players, but it will take another irl year/half year for them to get involved in war. They get rogue attacks but not so much as some of your others options. Terran is however, has a good military and is eager to fight and was on the brink of war two times past half year. But eventually war never broke out.
Terran is part of a strong alliance block with Barca and D'hara.
Barca is a finally quite stable starting new realm, who will need more nobles to expand.
Allthough taxes will be very very meager for a very long time.
They border the Zuma which is interesting and also a great food importer.
Rogues form a constant treat and become very dangerous in the winter times, this is what you will be fighting.
In the future they could see some interesting competition from the South.\
Barca is part of a strong alliance pact with D'hara and Terran.
Asylon is somewhat the same as described under Barca(starting new small realm).
The exception is that it holds much more interesting religious diversity and much less rogue attacks.
It has an interesting position bordering itualand, Via and Golden Farrow, it will see alot of new diplomatic situations and interesting political opportunities.
D'hara is quite different. A rich realm in constant struggle for food with no wars for quite some time and no rogue attacks(yes they never get rogue attacks, or perhaps very very rarely.) They thus suffer from too much peace penalties and constant starvation.
Could be interesting to find away out of this for them/with them.
In the past they did defend there homes vigilantly, but could not muster as much forces as Terran, who only has grown since then.
D'hara holds good close relations with Terran and Barca.
Fissoa is very ambitious, trying to ever expand beyond the possible borders.
They might have some interesting diplomatic options, but they have a territorial dispute with Luria nova that has caused many wars before and will probably not be solved as easily.
Fissoa holds decent relations with Madina and D'hara.
Lurian realms can be interesting at this moment, they constantly fight each other for power while they try to build up a cultural empire. They will found a new realm soon as well.
If you wish to be part of funding that realm, now is the time to join the Shinnen duchy.
The left overs of Cearwyn have an intresting struggle that would seem like a new realm as well, they will require lots of fresh minds with great and active diplomatic skills to survive, they will probably go for Itua and try to secure the lands they can.
Asylon could become an important ally against mainly rogues.
Aurvendil and Madina are the only realms with active warfare now, though it is a war fought on a small ocean channel between Fatmilak and Candiels, the hatred between the two realms is epic and atleast in Madina we have lots of roleplaying, drama and literally fighting for your life.
Madina or Aurvendil will remain interesting after the war, what ever side wins as Madina will see a great purge of nobles from the Former Cearwyn, one of Madinas many colonies.
Northern SA realms:
I do not know much about there possible futures but at the moment, mainly Astrum is working on establishing a new realm in Golden Farrow, they plan to put a fanatic fundamentalist in power there, which will be fun.
Sumerdale and Libero Empire might have some issues that won't resolve very easily that could turn out into a war.
Secession happen in the SA realms, but not very likley since there most fanatic and troublesome core is busy founding a new realm in Golden Farrow.
The SA realms have become closer together because of the past war against Cearwyn.
Corsanctum will probably be least effected by any possible war and it looks like they want to recolonize Unterstorm duchy, so they will need extra nobles.
Establishing a new realm there might also be an option for the future.
Looking at this, you have many intresting options.
But of course in the end, you will have to look for your self what suits you best and perhaps you can only see that when you truly joined a realm.
Friendliness to new players or openness to foreigners could also be important for you, which you will only notice when your character is part of a realm.
