I am looking to drop a few $$ into suspension (6gen i4 coupe), I already have:

Tein SS Coilovers
DC front upper strut bar
Eibach (SPC) rear camber kit

I was thinking about lower tie bars, sway bars rear upper bar? I dunno much about any of these and can't seep to find any good answers from searches.

I want to find out as much as possible...but also have some specific questions:

Are Acura TL-S parts interchangable with 6 gen coupe?
I heard Rear lower tie bar will push out camber...any truth? Should I be able to correct this with my camber kit?

Any difference between Acura OEM/Cheap Ebay/brand name (nuspeed, dc sports, etc...) suspension parts? <<I don't mind spending a bit more to get a brand name part.

If so, what should I look for when buying suspension stiffening parts?
Thanks in advance for your help!