After being pleasantly surprised by the low current requirements that the PIAA horns have, I decided to get these guys: https://www.amazon.com/gp/aw/d/B00067BWBI
Just installed them, between the big headlight nuts on the side and they are most definitely louder and sound more like an actual vehicle.
They come with some extra wires with ground tab connectors (spades? I don't know what they're called), which I modified to get power to both horns. Not the prettiest on the left side, I'm thinking of doing some heat shrink or electrical tape to make it all black and get the wires tucked away a little nicer.
I was pleasantly surprised, I thought I'd check em out and most likely return them, but although big,I found something that works. The mountain goat-ish aesthetics might not be a crowd pleaser, but I'm pleased so far.
I did remove two out of 3 stickers from each, considering removing the last one as well, although it's somewhat discrete.