The LS50 does sound like the Blades less the deep bass. I heard no harshness, the violin sounds great through them. For a little over 1K, they may be unbeatable. I typically don't pay much attention to Stereophile reviews except their bench tests, in this case I can agree with their reviewers including J. Atkinson who praised those little speakers and justifiably so. They do need a sub but probably would do fine in a small room without any sub.
The R300 sounds good too, but until you step up to the R500 and above, you are going to need a sub. I doubt the R300 can do much better than the LS50 in bass at all, perhaps just a touch better. In a small room both of them can survive without a sub.