I had a CX5200 that met with the same fate. Went through all the advice on this thread including a piece of software that seems to set off a bomb in the nozzles (i'll try to post the name when I can remember it). However, it is currently residing in the rubbish/garbage.
My brother works for a printer shop and wouldn't touch epson because cartridges are so expensive and you can't replace the head.
On his advice I am now the happy owner of a very impressive Cannon IP4000.
CBA