$1500 to spend...

I am with freediver on the suggestion to move away from floor standing speakers in that size room. True that stand mounts require stands at additional cost however these need not be cost prohibiting.  Audio Advisor sells quality stands.

Not to discount the Wharfedale speakers, I believe they represent good value at their price point, however I also believe they are the weakest link in your system. 

There are many standmounts that sold for $2500-$3000 that can be found used here an AG. As an example, I currently own a pair of Esoteric MG10s which I believe provide excellent sonics in my 12 x14' room.  Were I to sell them I would probably get $1400-$1500 for them. 

Once one identifies the sonic experience one is looking(hearing) for it is the combination of speaker and amplifier that will provide it.

I am somewhat biased for stand mounts over floor standers for use in small rooms. Though they lack the bottom octave many provide a very taunt and accurate bass over those frequencies they serve. Many can soundstage and image beyond the speakers. The smaller room  help to support lower base. That said, Jl35 is correct in that there are several smaller floor standers that are available that may augment bass over a stand mount and serve you well. Either way I would shop for a used pair. Possibility look into use of a subwoofer as funds become available.

I believe if one wants to get into the bottom octave with speakers one sacrifices too much from the others. The lower the price point the more true my belief is. Quality bass costs. I am not willing to make that sacrifice. Very little of the music I play contains much in that region anyway (rock, Jazz, pop, bluegrass, folk). 

Well, The gliders removed the drawback of the speakers, you liked the sound with the Brio, and now have a different amplifier to compare and with the option of tube rolling and provision of more power. Let us know the result, thanks.  

Thanks for the feedback, glad to hear that things worked out for you.