So enter the Eminence Lil Texas.
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Tone-wise the speaker is a little darker and has a bit more mid-range emphasis than the EV. This translates nicely as the tone I had dialled in before as I had the mid cranked on the amp already. Also the voicing of this speaker is much more suited to the drive channel of my Rivera, it has tamed a bit of the spikiness and added a bit more girth to the sound.
Would definitely recommend this speaker.
Also I used one of these cables to attach the speaker. Was very easy to do and saved me having to do any soldering. It's nice having a sturdier speaker cable in the amp as well.