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.html

In 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