I loved my 92 NF5. It was everything I wanted to do to my NSR250, already done! I understand what Andy says about the MC18 vs the NF5. It is a little harder to live with, no kick start, no side stand, all Avgas and pre mix, but it’s perhaps all these little annoyances that make you appreciate it more. It is more aggressive and peaky but I liked that.
I bought it with a new crank in, plus a spare low mileage one, plus 2 sets of piston so knew I had a few years motoring in it. Spares do come up fairly regularly.
Follow your heart , don’t be sensible, buy the NF5.
LOL