Interesting question. What single handed race boat??
I think you should also consider the kinds of regattas in your area. (Assuming you can play with the new toy in their sandbox)
Single handed with a chute really wants a big course. Otherwise.. you work your rear off in the hoists and take downs. So... if you are on a normal sized Hobie 16 course... you could be worn out by the third race of the day. If you are on a Nacra 20 course... you are a happy camper.
Its just one more factor in that decision!
My choice was easy since the growing racing fleet in the region was A cats and I found a boat to purchase.
Still miss the chute... thus the new boat name... Downsized!
Good luck