Confusing, I know. “Streetfighter” is a type of motorcycle, just like “chopper.” Specifically, it’s a sportbike that’s been stripped of its fairings and made to look more “urban” and aggressive. The Ducati Streetfighter is just that: their 1098 superbike with the fairing stripped away and the engine detuned, the suspension softened, fat handlebars swapped in for the base model’s clip-ons…
If you want the streetfighter look, just get a used Ninja 250R and strip it, get a new headlight, new handlebars, do some body work, and voila. Ninjas run somewhere between $1K-3.5K in the used market, so you should be able to find something that fits your price range.
But all the same, like everybody said, if you’re starting out, you should be concerned with finding a bike you can RIDE not a bike you can look at. Take it from another guy in his 20s. You’ll kill yourself if you give yourself enough rope…errrr, enough bike I mean, when you’re just starting out.