Supermoto/Travelenduro for little money + A2?

Moin, I make my A2 slip at the beginning of next year and want to buy a motorcycle of course I have little experience, I drive a Simson S51, therefore I have a small advantage, fittings and switching is basically the same. Car license I have already. Most important factor is unfortunately the money, can only spend about 1500€, protective clothing and helmet I already have. Do me a favor Supermotos and Travelenduros… definitely not the terrain I’m also more a careful driver, wheelies and other spikes I don’t need. Chopper etc. falls away, super sportsman is not my thing at all, at most an older “classic” machine (Suzuki, old BMW I find horny but really too expensive), but also no Naked Streetfighter part. I’m a good 1.88m tall, grow a little bit more. What kind of roadfighter is this? Models could fit for me? The Suzuki DR650, for example, seems to be in my price range, but is quite “voluntary”? Thank you!