The bass you want will come from the sub so woofer size in the bookshelf is less important. More vital is that your bookshelf have excellent coverage of the mids.
I haven't heard the Dali.
Re the other two - I would strongly suggest the Monitor Audio RX1 over either of them. Among other things - the RX series have a much better tweeter than the BX series, and, the RX-1's can be found on sale right now.
In that price range you might also check our the Ascend Acoustics...