Mate, if I were you Id definently be looking for a YZ85 BigWheel!!!
I was in this situation a while back where I was humming and harring about either buying a CRF230F or KX85 for my FIRST BIGBIKE. My first bike is the KLX110 I still have at the moment
Unfortunately for me I chose the CRF230F which now I regret. Even though the Trail Bikes are Easy and cheap to maintain, easy to ride and fun overall they dont have as much IMPACT on your Improvement in MOTORIDING Skills compared to a MX Machine! I have just recently SOLD my CRF230F and am looking at purchasing a YZ125 later this year.
MXBIKES WILL make you a BETTER OVERALL rider ESPECIALLY a 2BANGER!!! I think for you the YZ85 would be the RIGHT CHOICE as it will teach you...Not to be lazy, be on the ball, improve your clutch & gear selection & braking & cornering techniques and Im certain the you would have a HEAP more fun on a 2 Stroke then the 230!!!
Although it might be a bit intimidating the first few months, once you get use to the feel of a 2 Stroke Im sure you will love it! It will also be more exciting to ride and will be harder to ride fast and controlled which is a Challenge BUT it will really Shape up your Riding Skills a lot.
I hope you understand where Im getting at, GET A YZ85!!!haha.
Anyways thats my 2cents
If your want more help/info just get back to me!
GOODLUCK MATE