I'm in the NW too. Not as far as Alaska, but almost. I'm considering getting a T5 set up but not really sure if I want to invest the money right now. For now my west facing windowsills will have to do. And they do get a little chilly. My pereskiopsis seem to be doing fine so far though, but maybe grafting wouldn't be quite as easy.

My other option would be to get taller domes for my seed trays and have them on heat mats and have my recent grafts in there, but this would mean limited light. I wonder what's more beneficial- light or warmth?