Here's how I'd have liked Bleach to have ended...
Ichigo defeats Aizen.
Ichigo starts losing his power, getting weaker.
Gotei 13 invasion.
Ichigo loses his power, and confronts being powerless.
+Time skip.
Ichigo's Shinigami powers are restored (maybe he died and went to the Soul Society, which restores his reitsu and makes him a true Shinigami).
Ichigo now more powerful than ever (having unlocked Final Getsuga Tenshō for use any time now) takes over as Head Captain.
Ichigo hooks up with either Orihime or Rukia. Or, plot twist! Ichigo hooks up with Rangiku!
Good End
edit: Wow, that was weird... BakaBT wouldn't load there for a sec and I got this...
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Then it didn't load at all, and now it's back.