HI NoXX, thought I'd say welcome to the Lefty forum, and would like to help you with your Aria questions, but don't know much about them at all. Sorry 'bout that!
But, your idea to try another mid-range bass might be the way to go, and Ibanez's offer a lot of bang for your hard-earned dollars. Considering your choice of music, the SR series basses would give you a better, and harder edged tone. I'd say look for an Ibanez ATK, as an option for getting a Stingray, but lefties are hard to come by. I would say go to local music shops etc. and try as many left hand basses as you can find, or listen to your favorite players to see what they're playing, and see if you can find a used one.
That all being said, looking into a hotter active EQ and pickups might also be worth considering, especially if you like the feel of your Aria. Of course, it's always fun having more than one bass to play, so I doubt anyone here will be telling you not to buy another one!
Hot rodding is also fun too, how else are ya going to learn what's out there?!
Keep us informed on what you decide to do.....