This year, I have a new Close Contact - the Marcel Toulouse Legano and I love it. And I am in the process of buying a Marcel Toulouse Octavio Dressage Saddle for the 2012 season at Novice/Training level.
I know many Eventers who do all 3 phases with 1 to 2 saddles. There is nothing wrong with that. It is when you reach about Training Level to Prelim when you definitely want 2 saddles, it is not necessary to have 3 saddles until you reach Mid to Upper Levels.
Bridles, I have 2 set for Eventing. My dressage bridle with my German loose ring lozenge snaffle, and my Jumping bridle with my Myler Comfort Snaffle Full Cheek on it. I have another bridle, that is set for Fox Hunting, which only gets used when I am out on Hunts which has my 3 Ring French Link Elevator Bit on it.
I don't use a figure 8 or a flash with Nelson, I don't need it. If you don't need it, don't use it - it is entirely up to you and each individual needs. No martingales for me, but again, I don't need them.