I guess 'reasonable' will be a variable. I had no cover for the first couple of years and did not like the effects - mostly the problems with the freeze/thaw cycles in scuppers, etc. I then fought with wood frames and reinforced plastic tarps for a few years. Because I reinforced with fabric the tie-down points and cuts for stays, etc., and kept it all nice and taught, I got several years of use with them. My desire was for a Fairclough system, but they did not make one for the E27. So it was with much effort that I made my own framework for that style cover. I had a local sailmaker sew the actual cover and have since added more tie points, vents, and a more accessible 'door' opening. I wish now I had made the investment sooner.
Boom tents are used quite a bit in my area (south shore Lake Superior), but they don't give me the features I wanted. With my cover, I have room underneath to actually do some work on the boat in the iffy spring weather. It puts no stress on lifeline stanchions and better yet, doesn't require their removal. Since it is not supported by the boom, it works equally well whether the mast is stepped or unstepped. I have a metal conduit frame which is compact enough to get most of it on board before haulout which saves a lot of hauling up the ladder.
Whatever you do, keep things well-supported and not able to flap in the wind or retain snow load. When I look around at the covers in the fall, I can usually predict which ones will be in tatters by spring.
Walter Pearson