For your size and weight I would go with the 650. The 400 will feel really underpowered on the street, especially if you plan on doing any highway riding. Might want to also check out the KLR650...
__________________  2000 SV650: Desnorkled, rejetted and shimmed, Micron Exhaust, ZX6R shock, Racetech forks, Dominator lights, R6 throttle tube, various cosmetic parts/paint |