Cheap Supermotard

[RACER D12]

Ok so im getting my bike license next month along with two of my other friends. None of us have any real ridding experience. One of my friends just went out and bought a 08 GSXR-600 which i think was dumb because hes going to dump it lol I want a Triumph Daytona 675 but I decided im going to get a dirt bike instead and a street bike next year. Hears the plan I want a supermotard so I can ride it on the street and learn how to carve up the back roads but also still take it off road. I also want to ride it around town. So who makes the best supermotards for the price? I love the Aprilia's and KTM's but their probably too expensive. The other thing I was thinking is what if I just bought a dirt bike and put street tires on it? What type of dirt bikes would be best for that?