That's an interesting list of boats for comparison... What follows is just my opinion and thoughts.....
1987 Elite 364 - starting to get into the Euro look typical of French boats of that era. Larger aft cabins, some of the Elites (Kirie/Feeling) had a pilothouse look that took some getting used to, not unlike the early Beneteau Oceanus series
1985 S2 11.0 - a good design with good performance - if you like this one keep an eye out for a Sunstar 31 - a BC built near knock-off that may go for less.
1983 Ericson 35 MKIII - VERY nice cruising boat for couples and occasional guests. This era of Ericsons have a great interior, good cockpit ergonomics and a real nice "look". Friends have a 32 of the same series and love it.
1986 Express 35 - More racer-cruiser, Steve Killing did a nice job on this one, you need to like the rather angular look of the coachhouse. Probably the fastest boat on your list.
1985 Wauquiez 35 Pretorian - Good reputation, solid and probably on the heavier side compared to the rest. This boat may tend more toward the "Long J/Short E" measurements (skinny high-aspect mains and large headsails and kites) that can have some bad habits downwind in a breeze.
I'd think that any of these could satisfy your requirements, as could a few others equally well (C&Cs, CS, Tartan to name a few) With any or all of them you obviously need to get the surveys and inspections and make a decision with all the information you can gather.
You're "keep the debt down" approach makes a lot of sense!