Shouldn't any USB or PS2 keyboard work w. your PC? I think that things like motherboards and even some hard drives might be "proprietary" to where they must be the same manfacturers' product.
I needed a small keyboard, and I LOVE the little "clicky buttons" on notebook computers. I found: ZippyWK712 keyboard for about $30. Very small, light and has a brushed-metal appearance that is way-

in the blue-purple glow of the illuminated USB 2.0 mini-hub I hid under the top shelf of my PC furniture. Check out the net for other Zippy models.
For heavy-duty typing, like for work or a lot of Storm 2K'ing, the plain old Microsoft 'boards are great - especially the "wave" ones which are more hand/wrist friendly.
TIP: I put those little self-adhesive felt pads on my keyboards "feet" and legs. It now slides about easily, better for tucking away under the top shelf if I need to use pen and paper or let one of the cats aboard for a visit.
Keyboard story: I was talking to receptionist to get going on a phone repair ticket. She had just dumped a big ol' 7/11 styro-cuppa-coffee right on her keyboard. Tech-dude arrives, new keyboard under his arm. He picks up the old board and squints at it. "Did the coffee have cream and sugar?" Receptionist says yes. Tech-dude immediately twists a bit at the waist and (whee!) drops dead keyboard into the trash can. I guess they can take black coffee, unsweetened tea or just water. The sugary goo from sugar and creamers spell doom. With digital phones, forget it - any liquid gets inside and it's probably a goner. We had many KIA from 409 and other cleaners being sprayed directly onto the sets. Just dampen a clean rag instead and gently wipe the phone. It will stay happy that way.