@Umut: Rather than my reproducing the information here, for an explanation of the differences among various Alps switches, a good place to start is the DT wiki. I suggest starting with the page on Alps SKCL/SKCM Series:
If you want only a slight change from what you are already accustomed to, you might try the CoolerMaster QuickFire Stealth with Cherry mx Green switches. It is a solid reliable board with tactile clicky switches that are fairly heavy with an actuation force of 80g. It also has the wire Costar-type stabilizers, which I like better than Cherry stabilizers.
If you want something very different but probably reliable, you could look at some vintage keyboards such as IBM Model M on sites such as eBay or, more reliable but probably a bit more expensive on Clickeykeyboards.com.
If you don't mind strage layouts, many people agree that IBM Model F boards have a much nicer sound and feel than Model M. Again, you can find IBM XT or AT keyboards on eBay, sometimes at reasonable prices. Keep in mind that the XT will require a special converter for use with a modern computer.
If you want to risk the possibility of getting unreliable switches, you could go with a Matias-switch keyboard either from Matias or from vendors that sell Matias-switch keyboards such as V60 or V80 from KBP. I have had good luck with KBP V60 boards, but I got them several years ago before the current problems with quality control.***
If you want genuine vintage Alps switches, you could again go to sources of used boards, such as eBay. Sometimes there are still reasonably priced boards in okay condition. I've had good luck with Northgate for tactile clicky white Alps. Regarding white Alps clones, I recently got an Ortek board for under $50 shipped.
*** EDIT: This is not quite accurate. I bought a KBP V60 Type R Polestar with Matias Click switches from Mechanicalkeyboards.com in late October of 2018. It had a slight problem with one of the switches -- it registered but didn't click. I could probably have fixed this myself, but because it was still under warranty, I returned it to exchange for another one. I am typing on it now.
I got the Type R, because it is completely programmable using QMK, and I like to remap my keyboards to a HHKB-type layout. I didn't want or need the RGB underglow effects, so I moved the board from the stock translucent case into a TEX aluminum case. I also replaced the stock ABS keycaps with dye-sublimated alpha keys from an IBM 5140 and blank black spacebar and modifiers from Matias. For a bit of color accent, I swapped out the Esc and Right Ctrl (which I use as my Fn key) with red caps from Tai-Hao. To silence the spacebar, I replaced the slider with one from a Matias Quiet switch and put thin foam strips on the plate where the stabilizer inserts make contact.
This is a snappy little board with good tactility and very audible clicks. Although the TEX aluminum case looks elegant and has nice heft, I think I prefer the plain black plastic cases that KBP uses for its standard Matias-switch keyboards. The hollow plastic serves as a sounding board and resonant chamber that amplifies the sound. This makes a Matias-switch board very loud, but in the aluminum case it sounds a bit anemic, like a Cherry blue-switch board.