Yes the OS mounts are a tad pricey, but they are machined and not cast (like the old CB mounts) and pretty bullet proof. If needed you can drill and tap more holes in them; I've done it, but I always use the rear holes and just add holes for the front mounting lug bolts. And yes, you can soft mount the entire OS mount by using Lord mounts to mount the engine mount to the airframe <too many 'mounts' in that sentance>
Good Call, David!