GM1 because of its size - this has never been replicated
GX8 because its still the best RF type M43 and only ever Pro one (the GX9 is a GX90)
EM1-II (if it can be classed as older) because its as good as an EM1X for 99% of ppl
EM5 Mk1 because it`s cheap, lovely and has the best IQ if all the 16Mp M43 cams in RAW (along with the other ones that use that Sony sensor - EP5, EM10 /1and 2, EM-5-2 and Pan GH3 )
PEN-F because its soooo damn stylish
G5 - as a second body because they`re almost free yet you get a Genuine BLC12E (GX8/G7, FZ1000, FZ2000, G6 etc) battery and external charger with them worth more than the camera, its the only pre-G80 model I`ve seen other than the ugly G6 which for some bizarre reason doesn`t suffer shutter shock (or less than the G1-G3, GH1/2 and especially G7) , its hardly any bigger than a GF, has a good grip, a touchscreen which Sony users would kill for, AF is amazingly fast in Single AF and bang on accurate and the first cam to use the second gen 16Mp Panny sensor which was the point where noise at both ends of the ISO range and Dynamic range is pretty OK (first with usable ISO3200 IMO) .. far better ergonomics than the EM5 IMO and even the Field sequential EVF has really good optics in front of it - the G5 even does Full Electronic shutter (but its pretty slow scanning) .......
Quite a camera which can be had for £50-£80 depending on where and when you buy it or the condition ............. the biggie is the External charger and Battery which are worth £50 alone if you have a camera which uses the BLC12/12E and with a home made shim to wedge smaller batts in will charge anything from small GM batteries to GX80 ones too .
OK, I love the others mentioned and as an only M43 unless desperately short if cash, I`d choose one of them but for the £50 it can be had for, the G5 gets my vote, IQ wise its way better than any of the 12Mp sensor cams or the older 16Mp Panasonics and IMO handles better than any older olympus this side of an EM1
Tiny yet full featured, half the size of a G9 ..... love the front rocker dial, big grip, responsive twisty touchscreen and sturdy hotshoe, even has Custom modes on the mode dial
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** Please ignore the Typos, I'm the world's worst Typist **