A few random points on the S4R ....
You're committing to a single sided swingarm, which has implications re special tools and massive assembly torques needed.
The 4v water-cooled motor is more complicated to service and generally less clean looking than the 2 valve motors.
Both of these make it less suitable for home maintenance as well as making dealer maintenance more expensive. (which has even more relevance for a high mileage bike.)
It will have more power than you will probably need, as a beginner.
Its probably not the lightest of monsters.
All of the above may or may not matter .. its a personal thing.
That one is nice in that its clearly been well cared for but being a high miler its a good price.
The blue looks particularly nice, especially with the black wheels .. though I may be biased.
But for me, the S4R is too complex.
For background, I run an aircooled 750.
Blue, with black wheels.