When I first started flying the CRJ I went out and bought the telex 850. I was really disappointed as I could not hear anything. The Noise canceling didn't do anything. The CRJ is quite loud up front and having a quiet headset is pretty important. As one poster said the legs are not that long. However since the legs are short you use the radio 4 or 5 times as much. After doing a long 4 or 5 leg day trust me you will be ready to rip that headset off your head when you are done.
My recommendation is a full around the ear headset. I bought a DC X-11 and I think it was worth the money. Very light and I have used it for 3 years no problems yet. I would also say try the bose but I have seen numerous pilots with broken parts on their headsets that made them unusable.
Most CRJs have a telex as a spare for the jumpseater. Before I bought a telex use your regular aviation headset first as it will work fine and then try out the telex. You will see it is not a really good option.
After you fly for awhile you will see guys using all kinds of stuff so don't be in a hurry to spend your cash.