Need to buy a domain

I like to buy a new domain and want keyword presence in the url. One word domains are rare and may not available. So am go for two words domain like for example "templatespark". My question is adding an hyphen between words(like "templates-park") will benefit me in SE ranking? Which one would be best?
Suggestions please.

i personally would go for the one without the hyphen.

or you can buy both and test which work better, but i would also prefer a domain without hyphen

Guys, thanks for your advice. Probably, i have to consider staed's opinion.

yes, people will be forever confusing your template-spark with template_spark..... I go with the no dash consensus.

1 word domains are too expensive!

well template spark actually sounds really cool maybe even cooler than templates park. So that's a win-win... much better than penisland... hahaha although come to think of it, I bet they get more hits from the misunderstanding than from actual pen buyers... come to think of it again, maybe they intentionally included the erotic innuendo into their web address to elicit attention......

what about using "o" (the letter) in between words like PotOLuck or something like that...where you would otherwise use of?
-- That's what I read it as, template spark.