I love my silicone tubing. I even use the 3/8" tubing on my mash tun. I use the stuff from B3, non-reinforced. To clean my 1/2" ID tubing, I attach a small brush to a 48" long 1/4" maple dowel and run the brush all the way through the tubing after a 1hr soak in Oyclean.
I've never had a problem with the tubing collapsing on the intake side of my March pump. B3 says magnetic pumps aren't a problem with the standard silicone tubing. For a true impeller pump however the recommend reinforced silicone tubing which they also sell.