Kawagumby
Husqvarna
AA Class
Most who would commonly do this don't know the difference in superior design or materials and just go for Japanese bikes which are all cookie cutter bikes. They do this for the cheaper overall cost of parts and upgrades being less costlyand more plentiful in the long run.
What a load of crap.
You can mix parts on Jap bikes too (I do), and to say their components are somehow inferior says to me you are inexperienced when it comes to Jap quality. Japanese tooling is generally something to be admired. Bust a case? You can nearly always get a case half from another same model Jap bike and it will work just fine. I've owned KTM's and presently own a TE310 and I've never seen anything mechanically or quality-wise superior about them - but they do provide a different market option. Frankly, I prefer the simplicity of a clutch cable over a hydraulic unit, for example.
Funny you should say how you pass Jap bikes...like the bike is somehow the defining limit to speed. If that were the case, my old Jap KDX200's are quite a bit faster than the multitudes of shiney new KTM's I pass at the local riding area on a regular basis. But I'm not kidding myself... KTM's are the hot item now and plenty of newbies buy them too, reminding me of the mid 80's when everyone had to have a Honda CR500.