10bb/100 is tough to achieve. Even at $25nl. Over a large sample size (20k+ hands) I would gladly run 4-5ptbb/100 at any level.

That being said, there is no problem shooting for 10ptbb/100 just don't try to play a higher variance game because of it. Your goals at $25nl are this:

Get your PF game totally solid
Improve postflop game through better hand-reading and semi-bluffing
Grind out bonus
Move up quickly