CONGRATS on baby #2's (near) arrival! How exciting!!
I LOVE the Diaper Champ. It uses regular plastic bags (life the ones you get from a Supermarket when you check out) so you don't have to pay extra money or go out of your way to get refills. I actually stopped using it though & just flush the "solids" down the toilet & toss the dirty diaper in the trash which we tae out every night (pretty much). That way there is NO smell anywhere.
As for a monitor, we opted for a digital monitor because of interference. It's a Graco, no frills one & I love it. I don't see her but I didn't want to, it felt a little "Big Brother-ish" to me. I'm not sure who else makes digital monitors but that woul dbe my solution for static/interference.
Hope this helps &
Good luck!