IBIS means you can mount a manual lens and it will work, just dial in the focal length.
every year there's a new set of cameras with more pixels, HDR, focus peaking 1080P
recording at various frame rates, etc. and then the rumored (though likely to be very true)
about the mirrorless full/APS/half/quarter frame cameras from the (expensive) dinosaurs
like Canon, Nikon, and others with dozens of "lesser" to prevent impact to their
high-profit lines.
you have essentially two choices, a less expensive brand ( a $600 Olympus for example
versus a $2K Sony or a 5K Leica) or a used camera from a slightly previous generation.
that 1-4K savings buys a lot of lenses, filters, accessories. including manual lenses. and
you don't get schadenfreude when that next gen comes out, cheaper with more features.
my first was a Panasonic L1 - cheap because of one scratch. used phase detection and
using a manual lens you could get a green light for in focus pictures. then it was an Olympus
PL1, then a PM1, now a PL5. total for all was under $500, close to 0 since I sold most
of them. the lenses used $5-10 adapters and had Tomiokas, Canon 1.2s, .75x adapters,
and a 1000mm with a 2x converter and the only way you could use was with IBIS
even on a tripod.
not pushing any brand (have had a Panasonic GF1 also), but to me, jumping in and
spending a couple grand leaves little leeway, going cheap (aka inexpensive) means
lots of wiggle room.