After bouncing across potential spring types, and delivery dates (gotta race sometime), I chose Swift Springs from BC Racing NA.
A shipping snafu would have put the springs in my hands a few days later than was paid for. Upon BCR-NA getting word of the shipping situation, they immediately recalled the first set, and shipped out a new set that would arrive on time. The whole experience was very very professional.
The Swift Springs themselves are fantastic! They fit perfectly to the perches, preloaded nicely, and are performing well.
Don't be afraid to spend a couple more bucks for these Springs.