You can't use a simple splitter for your ethernet connection. You will have to either run a line directly to the modem or install some kind of router. Non-wifi 4 port routers are cheap, cheap, cheap.
Also, a lot of flat panel TVs have a motion smoothing feature. It makes me crazy because it makes everything look kind of artificial-plasticky-video(y). If your picture has that quality you can turn the feature off.
Finally, ditch the coax feed to your TV and use either the component or SVHS connection (SVHS is sometimes labeled S-Video). The coax feed is limited to 525 lines of resolution. The coax and SVHS feeds will do 720. It will clean up the colors, too.
Oh, the colors... if the colors seem a little too hot take a look at the demo setting. Most FS units have a store demo setting that jacks the brightness, color, and contrast wayyyyyyy up so the pic looks good under bright showroom lights. It's too much for home viewing. That feature can also be switched off.
Brad