You are not extraordinarily tall!! Hell I am 6'7" and I only consider myself taller than most.....there are guys riding stroms that are 6'10 - course anyone I have to look up to extraordinarily tall
I rode a 650 for 11 day through NZ - loved it- perfect bike for those little twisty roads and max speedlimits of 100kph! Got home and bought a 1000 lightly used, shortly thereafter (while the advise to but a day or two of riding is good advice- it aint' gonna happen you and I both know it).
I ended up buying raising with new dogbones to add an inch because I had put lowering brackets for the pegs (draggin parts if you don't compensate).
The ride difference is negligible - oh you will hear the 650 is flickable, and better off road, yada yada yada. The 1000 is just fine, 40 lbs heavier, and shitload quicker on the throttle. FLick a throttle or flick the handlebars, it all ends up the same.
It does have a noisy motor and if not sync'd and with the correct ECM installed or upgraded can be a PIA.....BUT once it's dialed in it runs just like a 650 with a pair big nuts only with more noises.
I would ride a 650 - I am not mocking them.....well yes I am but it's all in good fun.....they are a very good machine, probably a more effortless purchase, especially since the 'professionals' at most suzuki dealers couldn't tune a rocking chair. 650's are ready out of the box for the most part.
Look for an '06 or above - if you go with the 1000. Later 05 have all the bugs fixed though....so that would work if you could tell when it was produced.
Height-wise what's an inch one way or the other....not enough to make a big difference.