Don't worry about the rod-bearing issue, buy the E92 if you love it. If you can't get the issue out of your mind have a Blackstone oil analysis done to test the copper/iron levels. This can be indicative of a rod bearing issue on a used/unknown s65 motor. It's super cheap to have the oil analysis done, maybe worth it for peace of mind. Otherwise, it's around $3k to have the bearings replaced as "preventative rod-bearing maintenance."
How many miles are on the E92 you want?
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'10 6MT ZCP E90 M3 - Brembo: GT BBK(front/rear) / Dinan: Mid-pipe & Race SW, Pulley Kit, Stage 2 Suspension, Strut Braces, Rear Toe Links / AFE: Stage 2 Intake / BMW Performance: V2 Electronic Steering Wheel (w/ AutoCarbon CF Trim), CF Mirror Caps, CF Spoiler, CF Interior Trim / LTMW: 1M M3 Front Bumper w/ Slek CF Lip / AEPX: ARC-8s / Akrapovic: Rear Exhaust / Arkym: CF Rear Diffuser / Vinyl Styles: partial matte grey wrap / etc...