My Titans would be a premier team and be their own team and not a junior Justice League. The JL would still be THE team but the Titans wouldn't be on a lower level. Like the X men to the Avengers. Titans would be the fab fives generations team. The Teen Titans would still be around but it would be the newest generation like Damiens now and would just be a stepping stone to that generation getting their own team identity. Like Tims generation is Young Justice.
With all that being said my Titans team would be.
Nightwing
Flash/Wally
Troia/Donna
Tempest
Kyle Rayner
Connor Hawke
Lilith
Maybe Firestorm as well. It would be interesting to see Ronnie interact with them and he is the same age. Also he contributes a unique power set. As well as Supergirl/Linda Danvers for most of the same reaons. I would change her name to Flame bird though emphasizing the Fire angel aspect. Giving the team a magic side as well.
A mix of the fab five and heroes who started out as rookies in the 90s but have now come into their own. You can give Wally or Connor different super hero names to diffrentiate them from their mentors and have their own identity as well.