I'm near your size and weight and I consider the power adequate. Not spectacular but certainly no slug.
Now I am of the "More power is, well, more" school of thought. My 1050 Tiger for example has about 40 hp on the 650 Strom and its fun to have but not essential.
After you ride enough bikes you just realize its not all about power, but balance is important also.
I also have a BMW R1100RT which has a little more power than the 650 but also weighs more. Its not a rocket but its quite acceptable in its own way because the package is balanced.
I've never ridden a 1000 strom but I had its cousin an SV1000. It was an awesome motor. More than you needed but awesome fun.
I don't think you can go wrong with any of them, its all a matter of degrees and theres always something faster/better handling/more power out there.
'10 Tiger 1050
'09 400 Burgman
'01 HD FXD