I bought a pair of the Jabra C820s from Organiser World in Vic for $109 plus postage etc. After 1/2 dozen flights am reasonably happy with them. Figured at the price the Bose couldn't be 5 or 6 times better !
Concensus on the web (CNET and Choice reviews) seemed to be that they are close, but not quite (quiet ?) as good, as Bose QC2 and 3 at cancelling noise and with sound quality. If you just use the in-flight entertainment or an ipod then I doubt the difference in sound quality would be noticeable. I found the noise cancelling quite good but I haven't sampled either Bose model.
Only problem I experienced was that in Qantas business class I couldn't turn down the volume enough and this became uncomfortable after a few hours. (They have some amplication in-built.) Not a problem in British Airways though ??
At about $120 delivered , not a bad 'budget' solution.
An earlier post postulated that Qantas business class phones are Jabras, however they definately aren't the C820s.