Elise, that sounds gorgeous! The best advice I've ever heard is that at the end of the day, the only thing that matters is you, your groom, and your official. Everything and everybody else is just fluff.
I also walked down the aisle alone - my parents were in the process of an ugly divorce (my dad had abruptly moved out of state and made no effort to contact me at all until the day of my wedding), and I was nearly 30. The minister was really excellent about it -- said it was a symbol of my independence, etc. The only person who had a problem with it (besides my dad's grumpy old aunt "you'll regret it" - nope, never have!) was DH's DAD (who thought my dad was just being an arse).
My engagement ring was a 1ct amethyst. I had been engaged before with a small diamond ring, and since DH was in college, and the diamond he could afford would have been too similar the one with bad memories. For the same money, we got a honkin' big purple stone and I loved the reaction when I said it was my engagement ring. I was going to just keep it as my wedding ring, but then I saw a set of matching rings that I "had" to have for us. Yes, it was sappy, but I still love them.
All told, I'd do it again in a heartbeat. I'd change the church - we had a Methodist ceremony. In hindsight, I really wish we had married in the Unitarian Universalist church -- it's where I've found myself most comfortable and it fits much better with our beliefs. But the big floofy dress, big party, etc., wouldn't trade for the world.