For resale keep the oil furnace, and keep an eye on craigslist for a higher efficiency one for sale..
You can't sell a house or even refinance a house without a 'conventional fuel' heat system.. Mortgage companies have no imagination.
Adding a stove is a fine idea, but try to find one that has a fan then get creative with making a hot air duct for the stove, and make a
cold air return for the distribution fan on the stove, this makes it into a mini-furnace. Just heating the basement is not a good way to
heat the house above, the cold basement walls absorb a lot of the heat.
Read in the plumbing, chimneys, ducting forum about distributing heat, there are MANY threads on the subject.
Powerventing a oil burning device is a good idea, the powervent only runs when the oil burner runs, so it doesn't cost much
or wear out fast.
Let us know what stove you have in mind, we'll share our knowledge on the stove.