I've done serious research into this, and my finds are as follows.
Alphacool = Good radiators.
EK = Good water blocks.
Bitspower or Barrow = Good fittings.
Noctua = Good fans.
Laing = Good pumps.
So check out Alphacools radiators. They have all sizes and in a variety of thickness. Exercise caution if buying direct from them, as they seemingly charge more than retail stockist of their products and their shipping is costly.