Thanks, Whoololon.
Of the options you mention, I think the following could be a good choice, with features very similar to the Ripjaws:
Kingston HyperX Savage DDR3 1600 PC3-12800 16GB 2x8GB CL9
http://hardzone.es/app/uploads/2015/02/Tama%C3%B1o.jpg
They come with a case, but it barely protrudes a few mm at the top. I hope it doesn't touch the heatsink. If it does, then I'll opt for the Aegis that don't have a case.
I would love to be able to buy from Amazon too, but if I were to order any product from them, just for the handling fees when receiving it here, I could be forced to pay up to 50€ and sometimes more, because with private transport companies the amounts are more random than with Correos. This paradoxically means that we can end up paying more just for this absurd and abusive bureaucratic management than for the product itself with its shipping and taxes included.
For this reason we can only buy from PCC. Perhaps some company also offers some kind of similar solution, but I don't know.
Regards.