There is nothing wrong with the Sohc vtec motor.....its very capable of making power.
For the amount that a gsr or other B series motor swap would cost, you could have a full Greddy turbo setup with intercooler and probably still have some cash left over for some other small goodies. Then you could take her out to dinner or something
Personally, If you're trying to suprise her, start showing her pics of cars similar to hers, and really pay attention to what catches her fancy.
REMEMBER>>>>>THERE"S NOTHING SEXIER THAN THE SOUND OF A BLOW OFF VALVE!!!! pppoooooooosssshhh!!!