I have a cat, Stella, that has been about the same way. Ever since I got her home (tested negative for all the usual cat diseases) she sneezes, and has a congested nose. I can't tell you how many times I've actually had to pick dried mucous from her nose, because her little nostrils look completely plugged up. It finally got bad enough (after SEVERAL trips to the vet) that he kept her for a day or two, she got some shots, etc. and she got somewhat better. She still sneezes sometimes and still has dried mucous in her nostrils alot of the time. The doc said that this last time she really did have an URI. She would sneeze, and a string of mucous would come flying out. Poor baby. Now she has given it to our other young cat. So we are fighting it with her too.