What's on the wheel

I love my new wheel (Ashford Joy WITH a Woolee Winder -- I am sure there will be a post on that later). I especially appreciated it's smoothness when I got stuck in TwistsPerInch (TPI - for those non-technical and hence, sane readers). The problem was too much information, not enough understanding and conflicting formulas in my mind. The homework assignment was to spin ten yards of a plied yarn at 15 TPI. Sounds easy but it ain't! To make a long story short, in my frustration at not succeeding in this seemingly simple assignment, I said 'bugger it, I just want to spin and picked up a beautiful roving from Hummingbird Fibre Arts, consisting of Romney wool, mohair and silk and spun my frustration away'.
But now I am stuck on a totally different problem. How best to ply this wonderful roving (on the bobbin on the right)? In order to keep the varigated colours vibrant, I don't want to ply it with itself as the colours will mute each other. I could navajo ply it but that would result in a beautiful 3 ply and I am aiming for a 2ply. So I had my mother pick up some pink tone soft and silky merino/silk roving from the Loom at Whippletree (on the bobbin and wound into a ball on the left). It too is beautiful but do I want to mix them together (the pink/blue sample in the foreground) ? Decisions, decisions. I think I will spin up a few bobbins before I decide. Perhaps by then I will have figured out how to spin a 15TPI plies yarn.