i'm in the market to buy a used bike. I don't know how to ride, but a local Harley Davidson dealership offers a class. So i'm taking that first.
A friend of mine started out with GSX 750 and within a year he upgraded to the 1300.
I don't plan to go up to a 1300, but is it okay to start with a 1000 or just get a 750 ???
I took my MSF course at my local Harley Davidson too. Not sure how yours works, but my course was taught on 500cc Buell Blasts. I thought that was nice since the majority of the courses I saw elsewhere offered 250cc bikes and lower.
As far as which bike to start with, I think you should think about why you want a liter bike. Are you gonna be doing track days? I've been riding for 2 years and I'm still fine on my GS500F. I'd definitely upgrade if I had the money, but I don't feel like my motorcycle is underpowered by any means. I've taken my friend's ZX-6R for a couple short rides and I found it to be plenty powerful; I can imagine a 750 Gixxer would have even more power.
That being said, take whatever I'm saying with a grain of salt. I don't plan to ride on a track anytime soon nor do I ride my bike too hard. I think a 750 should be plenty for you to work with and I doubt you'll be bored with it anytime soon.