Turnigy are ok (though the name is a
little too close to turgid...)- take a look at Hobbycity's site to see some of their true 4S packs, the 30C ones are actually quite good as a budget option - they are also known as Zippy Lipos - check
here for testimonials.
Even so, I would go further and go for a well known brand with (most importantly) cell quality
you can trust.