Your question shows that the choice of an NLE is very personal. Some people would not consider capturing without scene detection, others abhor it, like yourself.
The A1 works with every NLE available, be it Edius, Avid, FCP, Vegas or Premiere. So the camera is not the issue here, it is your workstyle and the nature of your projects that determines what fits you.
The only advise I can give you is to try out the various NLE's and determine for yourself what fits you the best. As to using the trial version of PR, keep in mind that you must use DV material from your camera, since the trial version does not support MPEG.
I have the A1 (without the S) and it works just fine with Premiere.
I can capture with Premiere which will give me .mpeg files.
I can capture with HDV split which will give me .m2t and
i can capture with Cineform NeoScene which will give me excellent HD avi's.
I prefere the latter because its non compressed footage. The project opens like lightning.
Edting is like butter. So no complaints here.
It seems like one advantage CS5 might have over Avid is that Premiere can work with the native HD media, no conversions necessary.
I've got the XHA1 and I've only gotten more and more happy with the way Premiere handles it's footage. In CS5 Adobe finally got support for scene split with HDV, and it works like a charm, splitting only on the scene splits, not every couple seconds. As Jim said, it handles the footage natively, so that's a big plus. However, like Harm said, try several and find the one you like. I've used Premiere, Final Cut, and Pinnacle (Avid's consumer version) and of them all, I have found Premiere to be far-in-a-way the best editor. I've used it in version 6.0 (which kinda sucked, to be honest) and then from CS3-CS5. It's great software!