Whatever you choose, you want hub centric. Most people state H&R as a good brand for these. You'll also need extended wheel bolts. Should come with if you buy new.
There are some thoughts that spacers will put more stress on things such as bearings as you're technically extending the wheel away from them so the force would increase. Saying that, loads of people run with them and haven't had issues. You could potentially get rubbing depending on what wheel and tyre setup you've got.
I'm also looking for spacers but they are currently the least of my priorities ATM.
