A true DSLR requires that the remix mirror mechanically flip up and down for each frame. The higher end sports cameras are optimized to do this... but of course they cost more. But more than the fps, they also need an internal memory buffer to sustain that speed for more than a few frames.
The 7D II does that in spades (the 1D X is the king in that category... but has a price tag to match.). The 7D (classic) is still available and significantly less expensive (but still more than a 60D or 70D). The 70D is worthy of strong consideration because it's just 1 fps slower than the 7D (classic), but in a lower price category.