Tim's summary is bang on the money
That's one of the principal reasons we go to Brighton four or five times a year. Six trains an hour, and station staff who look the other way. There's also the backstop of Littlehampton trains coming through Hove. Southend is almost as good, and Whitstable has two trains an hour, and more trains from Canterbury. Bognor has three trains (you change at Barnham for two of them) but there are more trains from Littlehampton which is just down the road.
I keep an eye on the engineering works
http://www.southernrailway.com/engineering_works.php?e=228 and I know I'm not the only one.
Southend Victoria has only worked for us once, Southend Central trains have always been sufficient, and we did, in the early days, when there were about seven of us, have to cycle back to Haywards Heath from Brighton. Otherwise we've been ok, although next summer, if the numbers keep on going up, I'll probably have to start laying on a coach or two.
And, redjedi, I refer you to the 'questions, questions, questions' page in the lavish 2009 guide to the FNRttC, wot is in your inbox. I'll be asking questions later...