Kx100 or crf150r opinions please!?

Im 19 5'5 130lbs first bike 1982 mx 175 second 2002 yz 125 third 2008 crf150rb. I have a problem choosing a bike for trail riding. Some people say go with 2 stroke 125 some people say go to a 250 four stroke but i had a problem with the seat hight i got told to cut the seat out and move the forks. Then some people say go for the crf150r cause other bikes are too tall i had one but at time i had to sell it. Then some people say to get a two stroke cause there better for maintenance and cheaper for repairs, so i was thinking of a kx 100. And i wanna stick to a race bike in case i go to the track and not have like a ttr or a kdx. So from any of your guys experience or suggestions would be very much appreciated?