Most of my mates got 1000 cc’s. I got a 600, full race bike. On longer tracks I can’t keep up, the 1000’s just too quick bit on short tracks, like Pembry, they got no chance. I’ll never forget 1st time I took the GSXR 1000, the double take he too as I flew past him around the corner. He did however catch up on straight but couldn’t pass. Believe me or not (& I know most won’t) but the R1 had no chance & my mate put his bike in his van after 2nd session lol. Bit on straights, roads or longer tracks I got no chance but have as much fun throwing bike around. 1000’s just that bit heavier. My GSXR 600 (full race bike) does 0-60 in 3.1 secs & my mate with slightly older GSXR 1000 does it in 2,9! Both been tuned & remapped & impossible to get away that quick in real life, & we got similar skill. So 1000 not always quicker & a 600 is way more fun checkin it about, knee down at 120mph. What a rush. Sayin that, we both been taken by a 250 a few times. I’d say stop watching clock & have a bit of fun. Even a 125 can be fun, trust me. Which ever way you go, enjoy yourself buddy & be careful. Your so lucky you got the choice. If your new to bikes, maybe start with 600 then move up after year or so. Have fun anyway guys.