IMHO - The leap from my HK receiver to the 950/7100 was significant in sound quality and sound stage. While I never have heard the Sunfire/BK I would believe the law of diminishing returns starts to kick in once you go beyond the 950/7100. Why not try the 30 day trail? If you like it keep it, if not you are out only the shipping one way.
Also, save yourself some more money on the DVD player- get the Pioneer DV 563A universal player. It is huge bang for the buck and at $179 ( I got it at best buy for $159) it is almost throw away. Once again BB has a 30 day return policy.