Which 4 stroke after KDX200?

I'm 38yrs old, 6'2" & 220lbs without gear, a "C" trails rider who also enjoys MX tracks. I currently have a KDX200 with lots of mods. I rode a YZ250F last year and it spoiled me forever...I am interested in getting a modern 4-stroke because of its enhanced suspension and incredible power delivery.

I want to get better at dirt riding and my gut tells me that it will be easier to go faster on a 4-stroke. I've heard all of the arguments about their maintenance, and I don't mean to start a 2 vs 4 stroke argument here.

I've read great things about the CRF250X but I'm not sure if the bike is well suited to my size. On the other hand, I think the CRF450X could be a bear in tight trails. I've heard similar things about the WR250/WR450.

What bike should I look at for my next purchase?

Thanks guys, I really appreciate your help.

I've always had 2-strokes so this is a tough decision for me, but my gut tells me it will be less work (read 'easier') to go fast on something like a CRF250X. I had as much confidence trail riding on a YZ250F after 5 minutes on it as I did on my KDX200 with 1.5 years on it!!!

It appears that ultra-competitive woods racers benefit from powerful 2-strokes, but since I'm not in that category, maybe a smooth 4-stroke is in order??? (Yes I know that lots of GNCC racers use 4-strokes...)

If I do get another 2-stroke, it will likely be a KTM, maybe one of their new XC models coming out later this year. But I have read nothing but good things about the 250X, so it is hard to not consider it. I need to find someone locally with an X...