That's the kind of advice that will get someone killed.
SV is a great bike but not exactly n00b friendly. It makes around 75hp and almost 50 ft-lb of torque so it will sprint to 60mph from a standstill in about 4 seconds flat and run the 1/4 mile in 11 seconds in skilled hands. Also, because it is a V-twin you have a lot of engine braking off throttle which requires some finesse to operate smoothly.
Still, it's a lot better choice than a 600cc sport bike, but we don't need to rehash that nonsense again here.
Buy the Ninja 250 used and then sell it in 6 months when you're ready to move on to a bigger bike. I bet you don't lose any money on it as long as you take good care of it.
Jules, I agree with most of your posts, but not this one. I've been riding since '96, owned 4 bikes, 2 600s, a 750 & now a 1kRR. If I were to go back & do it all over again, I'd be bored as hell with a 250 in a month, 2...Tops. I have friends who started out on SV650's & they did just fine. Hell, I started out on a 600 F3 & I was fine.
I have friends who started out on 600s & they're on litre bikes now. This whole thing about starting out on a 250 & keeping it for months is nonsense. Unless you can wring that bikes neck at full throttle (which I don't recommend), you wouldn't even stand a fighting chance in riding with a group like the guys I ride with.
For reference, we went for a nice, long ride this weekend with about 12 bikes, most of which were 600s. For most in the group, that's their first bike & we all made it home in one piece. On a side note, we didn't obliterate anyone when we would hit a straight, which meant we didn't have to pull over every 5 minutes & wait for someone.
Keep in mind, the 250 tops out right around 90 mph. It's a great starter bike, but for most that buy them, they don't keep them long. If you're going to turn around & sell a bike in 2 months, it seems like a waste to me.