A wise move to stay away from the Comanche, it was a good aircraft in it,s day but the maintenance is now the killer on cost grounds.
I still dont think that the Arrow has enough speed or lifting power to make it worth the extra cost above a Robin DR400/180 however another option is the Piper Dakota it has the O-540 engine (230HP) but fixed gear, it is an aircraft that can lift a good payload a long way without the cost of retractable wheels.
If you are going for the retractable option the R114 or TB20 would get my vote above the Arrow they cost more but the extra cost above the DR400/180 is balanced by enough extra performance to make it worthwhile.
The last comment I would make is that you will not save any money if you keep your aircraft outside rather than in a hangar, the cost of re-painting along with the cost of fixing avonics & interior trim due to moisture will be about the same over ten years.
As to light twins................. that is another ball game!