Bikes got stolen, looking to get a new one...

Hello everyone. This is my first post. Last Saturday two of my bikes got stolen. 1983 YZ250 and 1979 RM400. Just as I was getting back into riding this happened. :bang:

I started riding when I was about 12, I'm 24 now. I haven't ridden a bike in at least 6 years. I started out on a Suzuki DS80, then moved to a KX80 (taller), and then got the YZ250 that I had for a long time. I put a new topend on it and that thing was pretty fast. I'm 5'9" and about 160 lbs.

Needless to say, I never really felt like I was in full control of the 250. After reading some of the threads on here I realize that it's probably true given my weight and height. Growing up with other dirtbikers it's always cooler to have a bigger, more powerful bike. I could care less now. I just want something I can have fun with on the weekends. All my bikes have been 2 strokes and now I want to get a 4 stroke. What do you recommend? I'd like to get something used that's no more than 10-15 years old. I don't really know all the 4 stroke models they offered throughout the years though. If someone can name some I would appreciate it. I'll be doing more trail riding and some small jumps.

Thanks for the replies so far. Would 4-strokes be more expensive to rebuild than 2-strokes? I'm talking about when it comes to rebuilding the top end. Do they last longer?

So right now I'm looking for a crf250, xr200/250, klx250, or even crf150. I'd rather not get a 450 because it's too heavy. I'd like to get a bike no more than 220 lbs.

What does the R and F mean at the end of the models? Like crf250r?

Great, keep the suggestions coming! I'm starting to get more of a feel for what bikes are out there now. I get confused because they discontinue models, come out with new models, use different engine sizes throughout the years, etc. So far I'm liking the Honda XR200/250, Kawasaki KLX300R, KX250F, YZ250F, RM-Z250, and CRF250X/R. Are there other similar models that I'm missing from any of the big 4 makers?

Also, is there such a thing as just a KLX300? Or are they all KLX300R?

Are the Honda XR bikes comparable to the Yamaha TTR bikes? Because the TTRs don't seem to have a very good reputation...

Basically, just as the YZ, KX, RM, and CR are in the same class; what would be in the same class as the XR or KLX in the past 10 years from the big 4?

Well I've pretty much got my mind set on a KLX300R. I rode one the other day and it's a nice bike. The XR is good too but I don't like how it's air cooled and I also can't seem to find that many of them unless they're really old. Thanks for the help guys.