Well basically the PS3's wireless refuses to connect on the crappy sky router. Worked fine on the BT voyager we used before. So I was thinking. Would homeplugs be a good solution to my problems. From what i have seen people tend to say they are quite good. So my question is would it be a good idea to invest in a pair to connect my ps3 to the interwebs with and what sort of money would I be looking at.

Definitly yes.

I had a pair ob 14 mbps until 2 months ago, when one of them decided to die.

I bought a pair of 85 mbps, for 90€.
They don't have any problem at all to me. They can increase a bit your ping, but nothing important. I don't have any problem to play or download.

One important thing, try not to have electric cords coiled. I had a max speed of 9 megas, after removing it I'm downloading from MegaUpload at 12 megas