So you mean things that you really have to hit, ok. Do you have space for an actual drum kit, or are you limited to just a plate with some hit-sensitive pads on it?
Next question: there's two parts: the triggers (drum kit shaped or just an array of pads) and the soud generator linked to it. Sometimes they're part of the same package, some you can buy separately. The better the triggers, the more realistic the drums as you play more expressively. The better the sound source, the better the sound, obviously.
In a mix, they can sound convincing if you've got good equipment. At least you're playing them "live", so there's no sequenced feeling to them.
I for one go for a very simple drum computer (Boss dr-550), but I'm on a tight budget and I don't know whether I'd be a good drummer
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