Naoto,
I know what you are talking about, as I had some old IBM keyboards in the past, but I must confess that I do not have many problems adapting quickly to new keyboards and I am unable to pinpoint with your accuracy the performance of a keyboard, so I am not sure how good my recommendation will be in this case, but I am very happy with my keyboard (and mouse from the same brand) and I see that they are very cheap now (at least compared with the almost 300 I paid for my wife's G15 a couple of months ago), this is my keyboard:
http://store.razerzone.com/store/razerusa/en_US/pd/productID.169417800, and this is a random review I just googled, I chose cnet for it was the first name I recognized of the list (google: lycosa review)
http://reviews.cnet.com/keyboards/razer-lycosa/4505-3134_7-32640959.htmlIn that review I do not agree with the lighting issues, I see the keys alright, although I have my computers in the basement and the lighting is not so bright, so may be they are right...
Hugo
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?
"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
"To die for a religion is easier than to live it absolutely"
Jorge L. Borges