Was your 125 a YZ-125 (two stroke) or a TT-R125 (Four stroke)?
The 230cc bikes would be the Yamah TT-R230 or Honda CRf230F. These would be almost twice the power of the TTR-125 but not even as powerful as the YZ-125. They would be great bikes for riding around on your property but I would not recommend them for riding any sort of competitive event, especially not an enduro. Although I suppose that if you managed to do an enduro on a TT-R125 the TT-R230 would be better than that.....
Fill out the form that you will find in the "sticky" in this forum so that we can get more information about you. Without knowing more specifics we can't give you decent advice.
Rod