I really wouldn't worry about the company's nickname. From the list presented earlier in the thread, maybe one or two of those are actually current, and the name really has no bearing on the atmosphere of the company. IE, "Free 19" refers to an incident some uncounted years ago where nearly the whole company was on restriction, hence the cry "Free 19!" That in no way implies that if you're in 19 you can expect a hard time.
Everthing you've heard about 25 is true. They love each other, for the most part, and are univerisally hated by the Brigade. This will be particularly true if you're in 26 (Rough Riders), as you'll have to deal with them over plebe summer as well.
If you're going to 26, feel free to PM me with any questions. I just spent my 4 years there. On a side note, getting Color Company was a complete surprise to everyone. I'm pretty sure we were the last ones 'trying' to get it.