JR 80 vs. PW 80

Right now I've got a KTM Jr Adventure 50 that my three kids share. For those who don't know, its a mellow two stroke, about as fast as a stock xr50.

I want to get a slightly larger bike for the older two to ride.

My daughter is 7 years old and weighs about 50 lbs. My son is 9 and weighs about 60 lbs. (they're both small and light). They're not wanting to race, just have fun at the track and in our yard.

I'm looking at a PW 80 or JR 80. Any advice on either bike? Any recommendations for another bike? I prefer two strokes, but I can be persuaded.

Thanks in advance!

scairns, thanks for the info. sounds very similar to my situation. if you bought your PW used, what things should I look out for? (I'll actually post this as a new thread).