I have been searching too since I got into this hobby, unfortunately found none. If you like the KSC-75, I am afraid you may not like warmer headphone, probably you want something with much bigger sound stage and better instrument separation while maintaining exactly similar signature. Don't get me wrong, IMO there are many better headphones out there with higher price tag of course, but in the end I keep coming back to my KSC-75, its just me I guess. It's a special phone indeed but still miles away from being the best, very fun to listen to, and to me, the vocals are perfectly positioned and I don't find the treble offensive at all as claimed by others. I have no issue with Grado brightness, so I have no problem whatsoever listening to KSC-75 for hours. To be honest, within your budget, you can already go for high end or even flagship headphone. I would suggest you to try and demo Beyer T1 (over your budget, its priced above RM3k). I don't think you can go wrong with that, but there is no guarantee you're going to love it either

Other recommendations:

1. Goldring DR150 (strongly recommended by HeadFi folks)
2. Alessandro MS1i, Alessandro MS2i - had this but I didn't enjoy it as much as I do with my KSC-75, weird right?

Demo them first. Cheers.