There is no such thing a good running cheap Goldwing. They can be had for a few hundred dollars for a bike that has been off the road for years, but if you want a safe reliable bike it will need tires, wheel bearings, brakes, carburetors rebuilt, tank cleaned and coated, electrical repaired, cables lubricated or replaced, new fluids in the shocks and maybe seals and this doesn't include the stuff that was broken that took the bike off the road in the first place. There are some really good mechanics on this site and they are not shy about help with good advice.
Back in Oct 16 I bought a '85 interstate with 62K on it and it was last licensed in 2006. I did all of the stuff listed above, got it running, but poorly. I rode it that way through what was left of the riding season in 2017. Early this year I went through the carburetors again and got it running very sweetly and took it for a week long tour of eastern Oregon. The week after I got back the alternator stator went out and I pulled the engine out My wife asked me to keep a ledger of the cost of the bike and I can post it if you want. Before the Oregon trip I was into it for 38 weekends in the garage and $3400. The stator was another four weeks and $300. I could have done it cheaper, but I like to use high quality parts.
Even after all of this I'm very glad I did this. I took the bike out today for a couple of hours and it put a huge smile on my face. I think it is just about dialed in, I want to get the radiator rebuilt still. Otherwise it has 65K on it now and I really trust it to go anywhere. If you care to read what I went through to get the bike to where is is today, these are the threads I have created JamesPal's the Diva
. You can see the issues and the great help my friends on this site have provided. You can expect the same.
Here are a few pictures of the bike, first is how far the bike was taken down, next is with the engine out to fix the alternator and last is what my bike look like today along with my '72 CB450K5. The last picture is of the 450 the day I brought it home, it was rusted solid. Anybody who goes through this is going to learn a lot. I hope you choose to go ahead with the rebuild. It takes a commitment.
EDIT: The link to my Diva posts doesn't work. If you want to see them, go to Advanced Search. It can be found under the Tools drop Down, Advanced Search, in the Search for type Diva and pick the Search Titles only option.