CODE keyboards are, indeed, some of the best I've found.
I run the CODE 104 MX Blue, and I've loved it.
- It doesn't slip (rubberized feet, and good weight).
- $145 (incidentally, all the CODE keyboards are well within your budget)
- Nice and clicky like a mechanical should be - but the "hail on a tin roof" is dampened so you don't get constant rattling (use MX Brown caps if you want completely dampened clicks)
- There's a version of it without a numpad
- It does have the Windows key not a command key - but you can disable the Windows logo key or swap it to function as a command key
- Backlit (adjustable and toggleable)
- You can toggle between QWERTY, Dvorak, and a couple of other layouts
I use it with a Windows laptop, so I can't guarantee it works on a Mac - but I'd imagine it does. Also, it comes by default as wired USB - this is convertible to a PS/2 connection, but I don't believe it's Bluetooth-enabled.