More accurately, 4 questions about 5.1 
I have just bought a new system and am currently using the onboard audio on an Asus P5Q Pro board. I have an old Cambridge Soundworks 4.1 system which is working ok but was considering getting a 5.1 speaker system.
Questions:
1) Is it worth my going to 5.1?
2) Will onboard audio be ok (gaming, some background music, no movies though), or is it pointless unless I shell out for a dedicated card too?
3) Is the Logitech X-540 good, is it worth paying the extra £20 to get the Creative Inspire T6200?
4) How long are the speaker cables for the rears of these systems, and can they be changed for longer ones?
Thanks

I have just bought a new system and am currently using the onboard audio on an Asus P5Q Pro board. I have an old Cambridge Soundworks 4.1 system which is working ok but was considering getting a 5.1 speaker system.
Questions:
1) Is it worth my going to 5.1?
2) Will onboard audio be ok (gaming, some background music, no movies though), or is it pointless unless I shell out for a dedicated card too?
3) Is the Logitech X-540 good, is it worth paying the extra £20 to get the Creative Inspire T6200?
4) How long are the speaker cables for the rears of these systems, and can they be changed for longer ones?
Thanks