.....Mine will cruise I-10 at 80 mph all day long with huge Givi side cases and top box.
If you are worried that the 650 is "not enough motor", don't worry.
If you are a speed freak, or want extra headroom for high speed motoring in the mountains, fully loaded, then buy a V-Strom 1000.
FWIW, I ride solo, but with hard luggage on the Interstate and she will run 85mph with zero drama.
Buy one, and if you hate it, sell it and buy a bigger machine, you won't lose money.
1997 Ducati Monster 750
2004 Honda RC51
2011 Suzuki GSX1250FA replaced my '04 Wee 2-14