For logging only, you don't need a console and can go with just an Envoy. The console can be handy if it is put in a "common area" location such as a kitchen, foyer, or similar. Note that both the console and envoy solutions include the barometer (the weather station does not provide this) and "indoor" temp/humidity sensors.
There are several options available for software. There are some that use just the Davis software while others use third-party (both commercial and free). The above mentioned WXForum.net
is a good source of information. The Davis WeatherLink board
sees far less traffic but has some useful bits.
If you plan on logging & uploading data from your weather station, you should also considering participating in CWOP - Citizen Weather Observer Program