Depends on what you consider 'decent'...but generally no, you don't have to spend that much to get a decent receiver.
In terms of multi-channel use, just make sure your speaker set can be driven with appropriate power to their specifications. With a powered subwoofer you should have less problems.
It can be difficult to satisfy both HT and Music demands with the same level of competence from one package. But since you have already mentioned possibly upgrading later you can climb that hill when you reach it.
