The SV is exceedingly common. From 2003 to present, they've hardly changed at all except in color so parts availability is incredible. I've been rockin' my '03 SV since 2004 when I bought it new and it's about to roll 35k miles of sport-commuting, riding the Dragon, track days, and now 4 crashes (last one was this weekend on the track).
The SV650 is generally a fantastic starter bike (Ninja 250 is always a good starter bike but the SV650 is too big and too much power for some. After a period of time, you'll probably begin to think you've outgrown the SV's power - when you get to that point, remind yourself you've still got a lot to learn. Take it to a track day and learn to destroy all the fancy, high-powered supersports; I'm not kidding when I say I've been outriding folks on bike with literally 100HP more than mine just because I've learned to ride it. The horsepower those bikes have is a poor disguise for poor riding.
Last I checked, the SV650 is as powerful as the Duc Monster 800 and far more reliable. The only maintenance I've done on my SV: tires, oil changes with Rotella, chain/sprocket clean/lube/replacement periodically, coolant/spark plugs/air filter at 25k miles. I suggest checking out http://www.svrider.com; it's a high traffic site but there is a lot of good info there, though some of it has really been muddied for various reasons.
I'm 6'1", 185lbs and I look a tiny bit large for it but that's really just how motorcycles go.