Can I pick your brain for a minute? Where do you fish? What are your plans for the rod...dries, streamers, nymphing, all? You are looking for a 9' 5wt only or a different size? Targeted species.
I warned you about that TCX. LOL. It's a beast and IMHO, a very limited use rod. If you're not casting 60'-90', it's REALLY hard to use because there's no feel and it's all based on timing. Most of us don't fish enough or well enough to just base our casting on timing.
I haven't cast what you are looking at but did check out the Sage site. The Response is listed as fast and the Accel is moderate - fast. I'm guessing the Accel is easier and more fun to cast for most conditions. If you are going to make longer casts,fish in windy conditions, throw bigger dries, the Response may give you higher line speed and allow you to throw tighter loops. Giving a little more info may help get a more accurate response.
Where you bought / returned the TCX, what other rod brands or models do they carry? Are you open to other brands? If you don't need a beast of a rod, the Sage VXP on closeout might be one to consider.
When looking at lines, I can't offer too much help on Air-Rlo... limited help on SA lines but am pretty handy on Rio thanks to many calls to their product techs. For some reason, I see mentioned on here to get Rio Gold if you want to line a ultra fast rod. I think that may be a typo and the person is thinking of Rio Grand. Basically, Gold is pretty much on the mark for standard weight fly lines. If you order a 6wt and weigh it, the line should be between 6.0wt and 6.1wt. Grand is a much more aggressive taper and would weigh out to be 6.8wt - 6.9wt The Rio Perception is in the middle around 6.4wt The LT should weigh out pretty close to the Gold but has a more delicate front taper to allow a more gentle presentation. FYI, that gentile presentation can also be accomplished with a Grand taper if the caster is good.
