Honda CBF 600 is my current 600 and first 600.
Cheap to run, a lot of fun. I'd recommend it.
Also if you're big then avoid fared bikes such as 600RR GSX600-R etc. Extremely uncomfortable I found which was sad as I had my heart set on a GSX
I take it you mean the GSX-R 600 Rather than the GSX600-F(Sorry, just pedantic mode in the ordering of letters lol). Did you try any of the older models, such as the K1-K3 GSX-R as they're quite big bikes, not like the new ones.