coxhaus- re: Long Ranger vs iVac. I have the LR, which works great- has a long range (duh!), and is bullet proof. I don't know a lot about the iVac, but it is a system which can automate turning on the collector, if you have a sensor (iVac Pro Tool) attached to your saw, which remotely turns on the switch attached to your collector when you power up your saw.
As I see it, the iVac is nice if you have trouble locating your remote control, or forget to turn it on, and have lots of money to spend. You need a sensor for every tool you have connected to your collector, so the cost really jumps up. As an alternative, you can buy a hand held remote, in which case you're basically doing the same as the Long Ranger, at a higher price.
Since both use RF signals, I don't think the range or working through walls would be any different between the two. (iVac says 40 foot range with remote, LR says 50 ft)
BTW, those cheap Christmas light remotes wouldn't work at all for your DC. I do have one, though, which works fine for my ceiling mounted air cleaner.