I want a supermoto too, but I wouldn't suggest you getting a suzuki. in terms of power, handling, reliability, and all-around looks, DRZ 400SM's fall short of KTM's and Husqvarna's bike in the same class. getting a DRZ SM seems to be the cheapest way into the supermoto world though, I agree with finding them for around that price. to me, there are levels of quality and power when it comes to bike manufacturers, like tiers. Aprilia, Ducati, MV Agusta are like top of the line, and make some sick bikes (for a hefty price). then a tier lower are your mainstream contenders, like KTM, Kawasaki, Suzuki, and Yamaha, and these are the most cost-effective. relatively cheap overall bike prices, and parts and mechanics are easy to locate and cheap as well.
but i'd spend the money on a KTM 525 SMR. loads of torque, classic KTM quality, and looks absolutely gorgeous. there's a 450 version too if you'd feel more comfortable on that.
if not that, then a Husqvarna 610 SM. no one rides Huskys around here, and they're so underrated. good looks, too
I'm leaning more towards one of these though. i was torn between supermoto and sportbike, for both looks and rideability. but when i looked at how i'd actually be using my bike and how i ride, this fit me perfect. naked bikes are so badass
Triumph Speed Triple R