Dominion28

Hi folks, First off I'll start by saying this is my first post and I'm not a bassist! I'm re-coning a set of extension cabs from my rehearsal/recording studio and I'm looking for recommendations for replacement drivers. The cabs are the Laney Ritcher series 4x10 and 1x15. I'm just looking to upgrade from the Celestion Truvox that were previously installed within a reasonable budget, but not knowing a great deal about bass cabs/speaker choices I thought I'd ask you guys. I'm not looking to go high end, I'd just like something a bit more reasonable to use them as individual 250-300W 8 ohm extension cabs for the RB8 combos I'm using in the rehearsal rooms (one on each). Any help you guys can give in pointing me in the right direction would be greatly appreciated. If any one happens to be in my area please feel free to come down to the studio thanks guys