My choice for a "new" bike was a '92 ST1100N Pan European. This, because it is a cheap and very reliable bike, known to be good for both commuting and long distance rides.
Logically a 20 year old bike will have some maintenance issues, to which I hope to present some guides and solutions here.
Budget for the Pan was tight since I haven't driven a motorcycle for ten years and all clothing and helmet had to be obtained new. General advise when becoming the proud owner of a used bike is to replace all fluids immediately. Because of the budget, It is not possible for me to do all on my wish list at once and I have to set priorities.