As a former flight attendant, my best advice would be to not spend too much!! I have had super expensive luggage (Tumi), medium-priced luggage (Travelpro), and super cheap luggage (whatever was cute at TJ Maxx). It all gets beat up, and when you spend a fortune on it, you feel obligated to keep using it no matter what!! My Tumi luggage was great, but I did have to have it repaired several times (although the lifetime warranty always covered it). The Travelpros were mediocre, but they were cheap enough to replace them. The best luggage I have found is something called a "Gorilla bag". It is a suitcase that is very light and almost indestructible. It only comes in really funky designs and patterns (certainly to tell yours apart from others), and has been just amazing!! We found them at TJ Maxx for about $150, and they have served us well.
However, if Baggalini is still manufacturing luggage, they make a REALLY good product. It is durable, but very lightweight. They have a website...you might want to google for it.
As far as getting something because airline employees are using it.....well, I just cannot recommend that. In training, you are required to purchase a set of luggage from the airline when you purchase your uniform. They usually give you 1 or 2 choices (usually Tumi or Travelpro) because those are the vendors who provide "kickbacks" or "incentives" to the employer. In training, we were all very pressured to go with the Tumi. Pilots were only given one option...a metal framed ballistic suitcase that weighs about 30lbs, but is extremely durable. Most flight attendants switch to a different brand as soon as their first purchase wears out.