Also realize that a sport bike has a turning radius that really is quite poor compared to a cruiser or lesser sport bike. I have a brand new '03 YZF-R6 (my first bike) and it turns like crap at slow speeds compared to my friends Ninja250 and my other friends Ninja600R, so it would be hard to ride in traffic in a big city.
And yes I have laid my bike down....just a stupid mistake, I missed my shift around a corner and it popped back into 1st gear when I let the clutch out, this locked the rear tire momentarily and down she went for her first 30 foot slide on the pavement. Its really didn’t hurt it very much, just took a strip of paint off the plastic. The next week I put frame sliders on it.

I would say an older 600 is the best starter bike. Not a CBR or a GSXR or a R6, those I would classify as Super-Sport bikes. You should look for a late 80s to 90s Kawasaki Ninja 600R/ES500, Suzuki GS500, Yamaha FZR600 or SECA 600. The ES250 is very slow and you will no doubt get bored with it in a few months.
My Friends have a '02 Kawasaki ES250, and a '87 Kawasaki Ninja 600R, The 250 is really really slow. The 600R is almost exactly the same bike except is fast enough to be fun. I would say the 600R has about 55%-60% roughly the speed of my R6, and it’s plenty faster then any car, the R6 can be quite scary and will do about 105mph in 2nd gear in about 5 seconds or so. The coolest sensation on the R6 is flooring it and once it hits 6000 RPM it lights up like a firecracker…zzzzzzoooooooooooommmmmm!
My ’03 R6 $9200 after taxes
The ’02 250 was $4000 new after taxes I think
The ’87 600R with 20k miles was $1500 and is in great shape.
Allways!!! Wear a jacket and your helmet at LEAST. Take it from me i slid for 30 feet with my FirstGear SpeedJacket on and i did not have a scratch on my arms. I would have been in the hospital without it, and the jacket is still useable.. Best $300 i ever spent.