Basically if you want to use Skype, receive emails, and navigate it is enough with the cheaper plan that any of the companies offer you. The companies that offer a land line with internet are Tricom, Wind Telecom and Codetel depends where you live. Tricom is a bit cheaper the the other two at the moment but not for much. The speed that will satisfy your needs will be no more then 1 Mb/s for this type of use. Expect to pay around 1,200 to 1,500 pesos a month including taxes.