I considered both, and ended up with the 630. For me, the difference ended up being the rave reviews I read about DPLIIx. Supposedly, it is a "must have" DSP. The 630 will be upgradable.
It will play louder than I care to listen, so I don't miss the difference in power.
Everyone who has seen it mentions how nice the 630 looks. The blue volume knob does look nice at night. That had nothing to do with my decision to purchase the 630.
I got it for $716 after shipping and a $50 mail in rebate. The 7200 was still around $900 back then.