Going from the S3.4 to the Focus 140, you will feel a loss of pressance. The large floorstander will play much lower than the Focus monitor. If you do not use a sub currently, you might find you'll need one with the Focus 140. That's not so much the case for the S1.4, though.
The S1.4 is a great speaker and the Focus is a very good speaker IMO. The refinement in the upper frequencies is very much the same between these two. However, the S1.4 will play a little lower. Both play loud and clean, though.
If I were to go with the Focus 140 I would match the Focus 140 with the Dyn Sub 250.....very nice!
One of the best combos IMO is the S1.4 and the Dyn Sub 500. The S3.4 is no match by itself against this combo.
You can email me at showplacetheaterandsound@yahoo.com or through Audiogon if you would like to chat more.
ttowntony