Do you want it for tournament- or casual use? For tourneys in the states you probably want an electronic one with presets and easy programmability (?). For casual, it's up to taste. I personally prefer a mechanical one for friendly games, so that's what I've got.
Let us know so we can recommend a brand.
What kind of clock do you guys recommend?
Basically, I want something cheap and easy to use... but at the same time I'd shell out a bit more for a clock if the cheapos are really garbage.
Any advice?