I also have other gear, like speakers and amplifiers/receivers, primarily vintage, though I still have a few headphone gear collecting dust.
I am just looking for a road bike in around the the 58cm frame size for the GF to ride around on. TBH, I was thinking along the line of an earlier road bike as if someone were to steal it, it wouldn't be an issue or if she grows tired of it, haha. Though, the body position may not be best, so a cruiser might be fine as well. I guess either men or female frame would do the trick.
However, I wouldn't mind a bike with newer shifters as I am not fond of the old friction shifters. I guess if I were to put a price point, would up to $300 be reasonable? I have absolutely no clue on bike value.