the K65 will cost you RM399 so thats a no go, there is a cherry branded mech KB but I heard the quality is not that good, The CM QFR is the best at RM299 but it's a TKL type so not sure if you will need the numpad

Honestly speaking, RM300 is kinda tight for a Mech KB 

Good that you sourced it out truly wish more people will do that before they ask here

If it's about the switches, it's best to get a fee of them, so far my preference goes to Brown switches as I've tried Blue and Black as well and found them to be unsuitable for myself

If you want a more accurate reply on mech keyboards, I'd suggest asking at the mech keyboard thread, they rarely visit the gaming keyboard thread haha  the people there will know the pros and cons of each and every type and brand there is to mech keyboard

I noticed that the Corsair K65 is TKL type, so if you want a full-sized keyboard, best to go with Rosewill RK9000. For which type of keys, best to let your fingers try them out. Some say Red is not suitable for typing and is more of a gaming switch, but I personally find them ok for typing. Guess it's a matter of getting used to.

For TKL MKB, you can also consider CM Quick Fire Rapid from lingloong (Garage Sales). For full-sized, CM Quick Fire Pro. Both are below your budget.

Except the fact that the previous batch of G710+ have LED issues and mine suffered from WASD delays, though all is good after the warranty.
Why don't just cough a little more to get Ducky Shine III, lalazai mode activated

Ducky Shine 3 is RM369? I'll contact him and buy whole stock XD.
Anyway go slow, it doesn't have to be one shot buy all.