what coin you think is worth to buy now?
Bitcoin
Look for Sexcoin, Quarks, Zetacoin and Fastcoin
These coins saw the most % rise in value today.
Maybe the OP should have better defined what he meant by "now"

Bitcoin is a good long-term investment. If you're looking to make quick returns, then look at some of the scrypt coins currently available. Whether or not those coins are worth long-term investments is an entirely different thing. It depends on what you mean by worth, and what you intend to do with them once you buy them.