Thanks for all the tips, fellas! It's been a good couple of days, got nearly a hundred miles on the bike now. Dodged a bus and an ice cream truck (of all things) along the way, and turned a couple heads as well!
I'll be prioritizing the NGK plug, saddlebags, and pillion pad, and look into the EFI silencer after that. I'd optimally like a little more performance out of the bike, but I know it's no streetfighter. I'd also like to run Royal Purple oil, but I'm still researching lubrication.
At any rate, I'm damn happy to be a Royal Enfield owner.