Thank you everyone for yr replies, feedback and suggestions...

Will goto heavyarm one day to test it out...

Besides the mech keyboard, why is everyone looking for keycaps ??

Some cool website for us to play around with keycaps combination.

http://lab.cubiq.org/kbcc/#WA,NN,WA,NN

That one isnt stepped 

double shot ek?

meh doubleshot abs. i dont like the finish on abs. but like i said, the red and black, lights wont go through, will make a neon light effect. the orange one, not so sure. i think will shine through. 

I tho ducky is always below?

May i get what's the meaning of getting shine? you mean thru the age of using, will it get shiny overtime?

or you mean that the keycaps reflective light from opposite light source due to coating?

it will have to depends on what type of PBT that you're going to purchase, if you're getting the IMSTO THICK PBT, i don't really think alot of light will goes thru the keycap itself.(the thicker the keycap, the lesser the light source will pass thru)

White or Rainbow is more possible if it compares to Black for the light source to pass thru the keycap. As they are more brighter in color.

I personally don't recommend black if you're doing this setup, due to the fact that, when you're using black ABS/PBT, and light source to pass thru, you will notice there's a cross that support stem.(it looks ugly to me)

i think China Taobao do sell those keycap that can let light source pass thru, but as for IMSTO Thick PBT, you will have to ask users here that already own those keycap to test it before you're going to purchase.

if the light source is just medium, and not "really really really" strong, i don't think you will need to worry about that.

I thought you're gonna do rainbow key glow by using LED inside. i saw quite a few people successfully do it, damn nice with the key glowing.

Anytime soon but just can't wait anymore 
For new mechanical keyboard i think u have to budget at least RM300 to get one. Ducky Zero / Rosewill
For black PBT, LED light definitely won't be able to shine through the keycap's surface.
You will definitely get the underglow shine effect with black PBT keycaps.

You can actually search from this thread whereby I did post up my ducky TKL (yellow light) with PBT keycaps, the light did underglow effect to the keyboard.

so red is lighter than blue huh,kinda too light then @@, looking for something in between blue and black actually ..any kind of switch like that exist?

I heard Shine 3 sometime in November - December only.