Fan choices?

As Bill says,i think 190 is about ideal to operate at unless you have detonation issues.
i tried 3 different fans on my own car this summer out of curiosity.A brand new Mopar performance fan and fan clutch ran 192 consistently and would hit 200 very quickly at the lights on hot days.An original mopar 7 blade fixed fan ran also 192 and would also hit 200 in heat at the lights,but took quite a while to get there.The last one is an 80's mopar flex fan.It runs 190 and has not hit 200 in traffic but comes close.
I think aluminum melts around 1200 or 1400 degrees but a lot of guys panic at 200 - 210.