I reckon you should get the tallest you can afford (even though it may be slightly heavier) At 6`2" I'd say get one that's as close to that as poss, maybe 170-180cm. Also don't forget the `head` will add a little height too.
If it seems too tall (depending if you're shooting level....or even towards the ground) you don't HAVE to extend the bottom, thinner sections, fully.
Also if you are going to be shooting up at the moon/stars etc you'll need a tall tripod to save you having to stoop & crick your neck, so imo get the tallest you can.
I'm only 5`9" & haven't even lifted the centre column on my Giotto, even for moon shots.
All imho of course, others may have better ideas.
btw,He who dies with the most toys, WINS!Nikon D800E & D700 bodies + Nikon 200-400mm F4 VR1, 50mm F1.4G, 16-35mm f/4G VR, 105 F2.8 VR macro, 70-300mm lenses. A couple of filters, Giotto tripod & ballhead. Lowepro Slingshot 302 AW