Jim, I would recommend a Powrtouch, mainly because I have one, and it is an excellent bit of kit, with a 5 year guarantee, and the company really do honour that guarantee.
If you have a problem while you are away, they wil arrange for an engineer to visit you on site to fix it, or at home,or in storage.
If you are not within an engineers reach, ie abroad, they will send the parts out to you,and explan how to fit them.
I do not know of any other company who do this.