If you haven't already, check out this timeless post for how to get started and what to look for on your initial boat inspection.
Boat Inspection Trip Tips
Not clear on how the multi works out better for computer etc... they present other challenges - usually homebuilt, often less space, moorage challenges with the extra beam, and so on.
Clearly your budget is rather limited since you looking mainly at near 40 year old boats. There's no need to look at something that's been 'rolled and dismasted' at some point - plenty of boats out there - you needn't knowingly inherit those kinds of issues.
I trust you know of Yachtworld.com, Sailboatlistings.com and other similar sites for searching specific age and price ranges.. they may open up the list above to other opportunities. Similar aged Cals, Rangers, C&Cs, Sabres (and many others) would all fit the bill and give you more different things to look for/like in those size ranges.