Almost all the ones that you buy now are pretty good. I personally have a Motorola in my home office and an RCA at my temporary home. They both work great and can be found cheap. I bought the Motorola off ebay for around $25 and the RCA from the local cable company for $45. If you are new to cable internet, some stores such as Best Buy, Circuit City, Soundtrack, will sell you the modem with a rebate that makes it free.