Coinbadse, coinmama and Cex.io allow you to buy using credit cards. Coinbase is one of the biggest exchanges in the world
The fee to use credit card is higher, ahout3-5%....
If it is the only way for you, go ahead, but I would suggest that you try another payment method.
Yes, these are the best options. Another one is virwox.com but in this one the fees are bigger and you can't buy bitcoin direct, you have to buy linden dollars and then exchange them for btc. They allow paypal as payment too. But this payment methods always come with big fees, not a good deal at all.