Yea, perfect bike. Its bike, and soft - you'll learn alot about cornering and how to handle a big bike. It'll be easier to go fast on a little RS125, but it'll be a no-brainer. You'll have to think for a while and really understand what it takes to corner on the SV, and this will prepare you much better for big motorcycles.
And even at 33bhp, you're looking at 100+ mph (if you can be bothered to wait that long!)
The punch of the engine in gears 2, 3 and 4 is very impressive - enough to remove you from the bike, if you don't exercise caution with the right hand on a set of twisty's. The low down tourque still remains, although the engine runs out of puff at 8,000 rpm (my bike is quoted as having maximum power, 33 bhp, at 7800 rpm according to the restriction certificate).
Oh, and the noise. The noise. The NOISE
You'll be hunting long tunnels just to get a good listen of the noise on the overrun...
A 400 would also be good, but bear in mind most are grey imports - might be lack of spares, and also most are getting on a bit now, so condition could be suspect.
Matt