i use my Innokin VTR when im outside, i do lawn care work. it is a pretty solid unit, not sure if it will be able to with stand afghan but hey.... its tough and i get it dirty as hell here. drop it and scuff it up, so far it is all good. not sure about what tank to get, i use a aerotank in mine and it is pretty good. not my favorite setup but i only use it when working, id rather hurt the VTR then any of my high end pieces.
but...... the more i think about it, that REO would probably be the best. no electronics to go wrong, if it acts up.... big IF...... you can just clean it up and move on. the REO would probably be the mod with the least amount of hassle. VTR and that ELVT would be alright too, they just have electronics in them so that is something you probably wouldnt be able to fix on the spot.
so i vote for a REO as well. i am gonna get one soon.....