as you do not need portability you should consider shure srh940. i know all three and the shure beats both akg in soundquality by far. but, if you need a v shaped signature you should go for the k545. comparing both akg, the k545 sounds more complete to my ears. the k550 sounds pretty thin and peaky. just my 2cent
Well, I actually own the Shure SRH940s. They are a great set of headphones, the best detail and clarity I've ever heard actually. They are, however, a little bright for my taste. If they had just a little less treble and more bass they would be perfect. I also own AKG K240, which I know doesn't have a very balanced sound. I think I'll just give the K545s a shot.