I can only comment on what I have read through a couple hundred different posts regarding headers...stick with the factory mufflers. Some have experienced a nice balance with the Borla's, Corsa seems too loud with a more noticeable drone (especially Corsa sport). Everyone else here will chime in on what has worked for them.
As for the replacement itself, with a lift it shouldn't be too bad. You just have to make sure to maintain the steering shafts' alignment (lock your steering wheel and mark the shaft before disassembly). Removal of the coil packs, dipstick tube, and spark plugs is needed.