Thank you all for your great advise and comments.
Some of my criteria; it has to be a brand new keyboard, audible but not loud (buckling spring too loud), tactile feeling (tactile bump or resistence from top of key), short to medium key travel, 60%-70% keyboard, some space between keys, good for at least 8 hours a day typing, not tiring.
So, I'm looking for a keyboard where I can type fast, accurate and as natural (fingers almost naturally type the correct letter, effortless as possible) as possible.
In fact, I quite like the Unicomp, but find it too loud. So, the Keytronic 3600U2 (ergo weighted), what I'm using right now at the moment, find it quite nice; Audible, yet not too loud. Keys between are well spaced, keys not too stiff not too light, tactile feel..but not tenkeyless unfortunately.
I find myself quite enjoy the Chicony and Dell SK-8115 as well..So it sounds like the Matias tactile pro 4 is going to fall off the list.
So, it comes down to 'rubberdome-ish' feel keyboards, like the mx Clear or the Topre 55g. A bit concerned about the 'heaviness/stiffness' of both keyboards. Cause, I bought the MX green, but kinda regret it, cause I find it too stiff. I've read the mx Clear may also be experienced as stiff, but because it is 55g actuation force and 100g bottom out, perhaps mx clear is less stiff than mx green? I did enjoy the Ghetto greens' feel by the way.
Also, I've read many users find the Topre 55g totally different from the 45g. Like its a whole other experience. 55g is more springy, gives more tactile feeback than the 55g. But then, I heard some find the 55g tiring for long typing sessions. Please help me out.