I have both an Arc and a Oxy-Acetylene that I use the most I've got some 251 cu ft oxy & 145 cu ft acetylene tanks and lasts me a few years never needed a Mig - Tig welder but would be nice to have.
All or mosy small jobs I'll use Oxy-Acetylene most but for heaver stronger stuff like trailers I'll use the Arc welder.
I'd also most likely suggest a Oxy-Acetylene setup fir your use but as others have mentioned maybe take a class to refresh your usage with one and may get a nice discount on some equipment from the school.
If you are interested in a oxy-acetylene welding kit have an extra new never used PM me if interested.