I use a 55lb explorer wing for both doubles and singles (with a STA) and it works just fine. It's not optimally streamlined compared to a 27lb wing, but I don't dive singles enough to warrant me buying a new wing.
I don't know much about these new Pioneer wings, but I've heard good and bad. I suspect they take a bit of getting used to -- probably a small learning curve for singles.
If I had to buy a wing, I would buy a Halcyon sight unseen. I would trust Halcyon (beyond all others) to have manufactured a quality product as everything I've seen from Halcyon is top notch. Also, if you don't like it, they'll take it back.
Good luck.
Mike