As much as I love tubes I think SS can sound pretty clean as well. I have a McIntosh reissue power amp from the mid 90's and I like it just as much as my Sansui SS components from the 70s. I run both components through a set of rectilinear 5 and Magnepan speakers. I am happy with how they sound.
When considering speakers, look into the crossover design, the cabinet design and what the effective range of the speakers are because all speakers will sound different considering the type of stuff you have in your listening area. if you have a set of speakers built, knowing these things will make your resulting product more fitting of your particular needs.