I too use SCS on a Windows PC, and have never looked back
However, if you must have a sampler box and don't want to use a PC program, I could recommend the boss SP-303 ... it's a pain in the neck to program the dinosaur flash cards they require, but it is relatively compact and has 8 big buttons that you can use to fire audio clips.
However if you're going to spend more than $50 on a used one and you can swing the desktop PC option, I would recommend that instead. Fyi, for the community theater I help out we have two desktop PCs (which I purchased used for under $200 each), cpus mounted away in a "rack" enclosure, with 15" monitor, keyboard and mouse on the table. Every show gets it's own "limited" Windows account that can't do much more than run the SCS program, Goldwave, and load/update files for playback. I've installed M-Audio Delta interfaces, the Delta 44 which can be found used for under $100.
-- john