USSJ: Ultimate Super Sayia-jin is a stage between the first and second stage of ssj. I believe futer trunks is the first to achieve the strength.He becomes USSJ when he see's his father get beat up by cell in the cell games.Brolly is best known for this stage.This stage is very noticable from the others because the muscles tend to buldge out a lot more than normal.
SSJ 3: SSJ3 is along with ssj4 and ussj the most noticable stage of super sayian.In this stage the hair is super long and spiked.Plus, they have no eye brows, which looks really wierd if u ask me.Goku and Gotenks are the only people who reach this stage.I've seen picutres of SSJ3 Vegeta but i'm sure they were eddited.
GOLDEN OOZARU: Golden Oozaru is the stage before SSJ4. In this stage the person turns into the big sayian monkey except it has gold fur and is much more powerfull.Plus, in this stage they re-grow their tail, and it, of course, turns gold.
SSJ 4: SSJ4 is the last form shown in dragonball gt.In this stage the shirt gets ripped off and it is replaced by red fur which covers all but the middle of the chest.Also they have long black hair.Plus, they keep their tail form the Golden Oozaru stage, except it turns red like the fur on their arms and chest.
SSJ 5: SSJ5 is from Dragonball AF which is a manga series.I am not quite sure as to wether or not it is still an active series but i have read that this pic i am about to show you is the only Dragonball AF picture drawn by Akira Toriyama, the creator of Dragonball.In this stage the person has long white spikey hair and white fur on their chest.Also, their skin has a pinkish tone to it and they have a strange skirt thing, and still keep the tail, however it, again, changes color to match their chest and arms (and this time their hair) and becomes white.