I prefer the GE 5800. From a contractor's standpoint, I like the idea that GE has their own service fleet so we don't have to learn how to work on these glorified window shakers. Also the 5800 is a quiet unit with 2 fans so no sound outside unless the compressor is running. Only HP I know of that runs the compressor & backup. The rest turn off the compressor which is less efficient. From what little experience I have, I'd say Amana tends to be more troublesome but popular due to low price. My ears say the new Carriers are noisier than the 5800.
How about the GE 3800, do they run the 2 fan config as well? I have seen a reference to a 3900 series. Will these be the replacement for the 5800? And finally, I will have my guy quote some GE's but at what point does the cost vs benefit fall? I mean if the 5800 costs are so much higher, where's the point I'm wasting money?