Good hotel pegged to the train station
Jury's Inn is a good hotel for whoever is attending a conference near Brighton but has to take the train (e.g. to go to Falmer for events at the University of Sussex). The hotel is standard but with very friendly service and the location is ideal.
Internet is super fast but they only offer 1-hour connections (for GBP5) without possibility of connecting on and off (and using credit as you like) or 24-hour connections for GBP 10.
This tip has the address "Behind the train station"