Neither of those are going to solve your "losing contact with the ground" issue over a hole, that's a damping problem which can only be solved by, replacing your dampers with something like Bilsteins (which are still not yet in production).
That being said, a RSB makes a big difference on these cars. You can also use a 19mm STI RSB and save about $100. A front strut tower brace is ok, GT Spec is another option, Whiteline is good too, neither are going to make much of a noticeable difference (although that being said, I've usually ended up putting front strut tower bars on my cars because it's a cheap 5min mod that makes the SLIGHTEST of differences in initial turn in response).