Just an update on my findings regarding Onkyo, PS3 and Jamos:
What I ended up going for.....
Speaker wire: silver micro from Richer Sounds (worked well, nice colour and is silver plated. Could have probably got cheaper wire to be honest).
Any decent HDMI cable for connection from PS3 to AMP will work well (just make sure it is shielded and is made well, if your going for longer lengths over 5m then spending more might be required). I went for the one from here http://ukhdmi.com/hdmi-n-premium.php
Optical Cable from sky: I went for the IXOS Toslink again from richersounds (again shielded and decent make).
So far so good, the auto setup of the AMP does pretty well. However I found that I needed to manually go into settings and pump up the Treble DB's, otherwise the sound sounded a little flat. Speakers sound really good with music, better with films. Football doesn't even broadcast in 5.1........but put AMP onto the "NERO 6: Music" setting and it produces excellent sound. The AMP does pretty well converting stereo to 5.1 actually, i'm impressed.
The Jamo SUB is amazing, I can not see any reason why you would ever need to upgrade this (for a normal size lounge), I am nowhere near running it to it's full capacity.
Anyway hope this help's you guys, I know how hard it is when trying to chose what to buy.