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I'd also recommend a 3 way splitter instead of two 2 way's. Each tap will degrade your signal by roughly 3db. Most typical residential installs can loose about 18db (6ish taps) before you will notice problems. Cable modem tolerences are a bit less, but usually a 9-12db swing wont make them have issues.
Also, signal problems with your modem will be most noticable if you cant maintain a solid a acquisition of the HFC network, not upload or download speed. Your biggest sign of problems with splitters is where you loose link every couple of minutes then will re-establish it.
As to buying a splitter -- make sure what you're buying is capible of passing the band your cable modem works in. Most cable providers use modems which are sending their signals at a much lower frequency than what your TV channels are using (cable modems operate in the sub-VHF spectrum), and a splitter won't necessarily be rated to pass those frequencies. They can split your normal TV fine because its within its range, but your cable modem won't have much of a singal through it. So just make sure what you are buying is rated for frequencies low enough for your cable modem.
Gold plating is mostly a marketing scheme on RF connectors, and performance gains are minimal.
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