looking for a new bike

I consider myself a pretty good rider but the only bike I have ever owned was a kdx200 which i liked alot but it was getting old and it was too I wanted somethign lighter so i sold it. Now im looking for a new bike I have been thinking a 125. I want something cheap that I can use for woods riding but I also want to do some track riding and learn to jump. Also just bumming around in fields doing wheelies and stuff. Does a 125 sound like a good bike for this? I was thinking maybe with a flywheel weight or something for trail riding a 125 would be good. Any thoughts? thanks