heres my recommendation:
zx6r is my paintbrush if you will. its the tool i ride most for work. a fantastic bike with ample power and is so light i can throw it around like a toy.
traditionally the zx10r is a much more demanding beast, traditionally its a much heavier bike, traditionally its a more speed oriented large track bike. and traditionally i would NEVER recommend this bike to a newer rider in ANY capacity...
that being said the 2011 is completely different. its only 5 lbs heaver than the zx6r, and with the power control/ABS brakes.. i would daringly say it is actually overall a safer more potent bike than the current zx6r even for a newer rider. i would have my inexperienced GF ride on of my 2011 zx10rs over any of 07-current zx6rs... i really believe the new advancements on the bike allow for the zx10 to be much more leinient to mistakes by the rider. that being said.. it is still a 200hp 200mph capable machine.. regardless of what bike you ride anything that fast is inheirently dangerous.
that being said.. id recommend to you neither of those..
you mentioned wanting to ride distances.. the idea of riding either zx6r or zx10r for any length of times over a few short hours is scary! you literelly couldnt pay me to ride one from las vegas to san diego. and at 15K+ for the new zx10r that a serious investment.
id recommend to you the new ninja 1000, or my honest to god absolutely favorite bike i own the 2011 Z1000. it kicks BUT.. if you already have the ER6N (which im proud to say is the bike i personally got to launch to the american public at the dealermeeting 3 years ago. first person to ride one in the US

) if you have a er6n than the new Z1000 is its badass older brother that is slaying through girls everyweekend and basically better at everything you can do.. period... and at 5K cheaper.. both Z1 and ninja 1 are same price as a zx6r, and with exception of tight tight canyons... a zx6r would never stand up to the others in a light to light race.. Z1 is fairingless however so anything about say 90mph and a zx6 will dominate it..
but enough.. i ramble...
my point.. take a serious look at the Z1 Ninja1 and ZX10r...
all are great great bikes.. and between zx10 and zx6 for the street.. id always go zx10r...
600s are just too damn whinny for streets for me.. i like the grunt of a literbike
-kane