I own a '07 CBR600rr and ride it daily. Twisties, 1/8mile Track, Highway, Around town. 1st gear does 72mph, 2nd 102mph(indicated), 3rd 126-7mph(indicated), 4th I haven't topped out. If properly launched I've seen the bike do 7.3x at 104 mph in the 1/8 with no mods.
You said you road the Gixxer 1000 and did not take it over 5k. .. If you have the bike available to you again .. hop back on it and give it a good crank.
The reason why I like riding the 600rr so much is, even under WOT(wide open throttle) in 1st gear up to Redline,
only occasionally will the front tire pull slowly off the ground. The 600rr is pretty peppy around 3.5k - 5k ..but kinda drops off and then pulls very hard at 7.5k up through Redline safely i.m.o.
Though wanting that same feeling you're looking for, I've decided that I needed a little more torque off the line through my first 3 gears .. so I decided to go with a slip-on and +2 rear sprocket. Tomorrow they are being installed so if the weather holds up I will let you know what I think.
I'm comparing this to a '06 Kawi 636 with PowerCommander, Araka Slip-on, BMC Airfilter. When I road that, the bike's front tire in 1st gear just pulled slowly up off the ground everytime and pulled Extremely Harrrd. It was nice... lol.
I've raced Liter bikes b4 and they just pull like you wouldn't imagine .. a raped ape, its sick. If you're looking for that "pull" factor the liter bikes have it.
How comfortable do you feel with your riding abilities?
There IS a noticeable difference in acceleration between the 600 and 1000 bikes.
The 1000's are a loot of bike. If the fact you are riding a sports bike doesn't bother you and you're aware of the differences between the sportster and sports bike and can handle them......then go with the 1K. If not, go with the 600 and learn on that .. you'll still be happy and alive.